Delete SpecRunner Jasmine files

[ebogo1]

Another part of #10134 - after this PR the only work left should be to update the Jasmine version we get from npm and clean up our matchers/syntax in specs if needed.

This gets rid of:

• ThirdParty/jasmine-2.2.0/*
• Specs/SpecRunner.html
• Specs/spec-main.js (our modified version of Jasmine's boot.js for browser standalone)
• Links and references to the SpecRunner

[cesium-concierge]

Thanks for the pull request @ebogo1!

• ✔️ Signed CLA found.
• ❔ CHANGES.md was not updated.
  • If this change updates the public API in any way, please add a bullet point to CHANGES.md.
• ❔ Changes to third party files were made.
  • Looks like a file in one of our ThirdParty folders (ThirdParty/, Source/ThirdParty/) has been added or modified. Please verify that it has a section in LICENSE.md and that its license information is up to date with this new version.

Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.

[ebogo1]

Also - should there be a CHANGES.md entry for this?

[ggetz]

Also - should there be a CHANGES.md entry for this?

Let's add it for completeness since we removed the test link from index.release.html.

[ggetz]

Thanks @ebogo1! The functional part of this PR is all working as expected. Let's just make sure the testing guide still has all the necessary info before merging this.

[ebogo1]

@ggetz Should be good after 7d5ff56 passes!

[ggetz]

Looks good! Thanks again @ebogo1 !