Don't activate tab on right click

[bsclifton]

Test plan

1. Open two tabs. Set focus to tab 2
2. Right click tab 1 and verify context menu appears
3. Press ESC (if your keyboard has it 🤣 )
4. verify menu closes and focus did NOT change
5. Right click tab 1 so that context menu appears
6. Right click another place in tab 1 so that the context menu closes then reopens
7. Verify focus did NOT change
8. Push ESC and verify menu closes / focus did not change

Description

Fixes #7327

Auditors: @NejcZdovc, @cezaraugusto

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[bbondy]

Would be good to get a test for right click on tab doesn't cause active tab switch, but I'll pull this in.