Remove unused sourcemap upload scripts

We currently upload sourcemaps to https://cdn.hypothes.is alongside the
JS bundles for a particular client release. Sentry will fetch them from
the URLs specified by `//# sourceMappingURL` comments in JS bundles
without us having to upload the sourcemaps to Sentry directly.

We were not running these scripts as part of the current QA/prod release
process on Jenkins.

gulpfile.js

@@ -355,21 +355,3 @@ gulp.task(
   'test-watch',
   gulp.series('build-css', done => runKarma({ singleRun: false }, done))
 );
-
-gulp.task(
-  'upload-sourcemaps',
-  gulp.series('build-js', function() {
-    const uploadToSentry = require('./scripts/gulp/upload-to-sentry');
-
-    const opts = {
-      key: getEnv('SENTRY_API_KEY'),
-      organization: getEnv('SENTRY_ORGANIZATION'),
-    };
-    const projects = getEnv('SENTRY_PROJECTS').split(',');
-    const release = getEnv('SENTRY_RELEASE_VERSION');
-
-    return gulp
-      .src(['build/scripts/*.js', 'build/scripts/*.map'])
-      .pipe(uploadToSentry(opts, projects, release));
-  })
-);

package.json

@@ -91,7 +91,6 @@
     "raf": "^3.1.0",
     "redux": "^4.0.1",
     "redux-thunk": "^2.1.0",
-    "request": "^2.76.0",
     "reselect": "^4.0.0",
     "retry": "^0.12.0",
     "sass": "^1.23.0",

scripts/gulp/upload-to-sentry.js

-'use strict';
-
-const fs = require('fs');
-const path = require('path');
-
-const log = require('fancy-log');
-const request = require('request');
-const through = require('through2');
-
-const SENTRY_API_ROOT = 'https://app.getsentry.com/api/0';
-
-/**
- * interface SentryOptions {
- *   /// The Sentry API key
- *   key: string;
- *   /// The Sentry organisation to upload the release to
- *   organization: string;
- * }
- */
-
-/** Wrapper around request() that returns a Promise. */
-function httpRequest(opts) {
-  return new Promise(function(resolve, reject) {
-    request(opts, function(err, response, body) {
-      if (err) {
-        reject(err);
-      } else {
-        resolve({
-          response: response,
-          body: body,
-        });
-      }
-    });
-  });
-}
-
-/** Create a release in Sentry. Returns a Promise. */
-function createRelease(opts, project, release) {
-  return httpRequest({
-    uri: `${SENTRY_API_ROOT}/projects/${opts.organization}/${project}/releases/`,
-    method: 'POST',
-    auth: {
-      user: opts.key,
-      password: '',
-    },
-    body: {
-      version: release,
-    },
-    json: true,
-  }).then(function(result) {
-    const success = result.response.statusCode === 201;
-    const alreadyCreated =
-      result.response.statusCode === 400 &&
-      result.body.detail.match(/already exists/);
-
-    if (success || alreadyCreated) {
-      return;
-    }
-    throw new Error(
-      `unable to create release '${release}' in project '${project}'`
-    );
-  });
-}
-
-/** Upload a named file to a release in Sentry. Returns a Promise. */
-function uploadReleaseFile(opts, project, release, file) {
-  return httpRequest({
-    uri: `${SENTRY_API_ROOT}/projects/${opts.organization}/${project}/releases/${release}/files/`,
-    method: 'POST',
-    auth: {
-      user: opts.key,
-      password: '',
-    },
-    formData: {
-      file: fs.createReadStream(file.path),
-      name: path.basename(file.path),
-    },
-  }).then(function(result) {
-    if (result.response.statusCode === 201) {
-      return;
-    }
-    throw new Error(
-      `Uploading file failed: ${result.response.statusCode}: ${result.body}`
-    );
-  });
-}
-
-/**
- * Upload a stream of Vinyl files as a Sentry release.
- *
- * This creates a new release in Sentry using the organization, project
- * and release settings in `opts` and uploads the input stream of Vinyl
- * files as artefacts for the release.
- *
- * @param {SentryOptions} opts
- * @param {Array[String]} projects - A list of projects to which to upload
- *                                   files.
- * @param {String} release - The name of the release.
- * @return {NodeJS.ReadWriteStream} - A stream into which Vinyl files from
- *                                    gulp.src() etc. can be piped.
- */
-module.exports = function uploadToSentry(opts, projects, release) {
-  // Create releases in every project
-  const releases = projects.map(function(project) {
-    log(`Creating release '${release}' in project '${project}'`);
-    return createRelease(opts, project, release);
-  });
-
-  return through.obj(function(file, enc, callback) {
-    Promise.all(releases)
-      .then(function() {
-        log(`Uploading ${path.basename(file.path)}`);
-        const uploads = projects.map(function(project) {
-          return uploadReleaseFile(opts, project, release, file);
-        });
-
-        return Promise.all(uploads);
-      })
-      .then(function() {
-        callback();
-      })
-      .catch(function(err) {
-        log('Sentry upload failed: ', err);
-        callback(err);
-      });
-  });
-};