Deprecate jsApiReporter and remove it from boot1.js

jsApiReporter was initially added as part of the pre-1.0 Ruby based browser
runner. It looks like it was designed to resolve a race condition betweeen
jasmine-core's startup in the browser and the Ruby runner's startup. Modern
runners handle that either by buffering messages in a custom reporter (e.g.
jasmine-browser-runner's BatchReporter) or by calling env.execute() after a
communication channel has been set up (e.g. the old Jasmine ruby gem). In
any other context, a custom reporter is easier to use than jsApiReporter
because it doesn't require polling.

Adding jsApiReporter to the env imposes small but measurable penalties in
time and space, both of which are proportional to the size of the test
suite.

Other than jasmine-py and Testdouble's jasmine-rails gem, neither of which
ever supported jasmine-core 4 or later, I can find scant evidence of
interest and no evidence of usage after about 2012.

src/core/JsApiReporter.js

@@ -1,11 +1,13 @@
 getJasmineRequireObj().JsApiReporter = function(j$) {
   'use strict';
 
+  // TODO: remove in 7.0.
   /**
    * @name jsApiReporter
    * @classdesc {@link Reporter} added by default in `boot.js` to record results for retrieval in javascript code. An instance is made available as `jsApiReporter` on the global object.
    * @class
    * @hideconstructor
+   * @deprecated In most cases jsApiReporter can simply be removed. If necessary, it can be replaced with a {@link Reporter|custom reporter}.
    */
   function JsApiReporter(options) {
     const timer = options.timer || new j$.Timer();