Remove the experimental TypeScript flag and use vRBT 2.12.5 as default

[nblagoev]

Description

Remove the experimental TS flag and use latest fling version by default

Checklist

• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have tested against live vRO/vRA, if applicable
• My changes have been rebased and squashed to the minimal number of relevant commits
• My changes have a descriptive commit message with a short title, including a Fixed #XXX - or Closed #XXX - prefix to auto-close the issue

Release Notes

• Enable TypeScript features by default
• Remove the experimental TypeScript flag from the settings
• Use 2.12.5 as default vRBT version

[vmwclabot]

@nblagoev, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit ccc0548 must be signed by blagoevn@vmware.com