fix(tabs): add fallback to select tab if router integration fails #30599
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Issue number: resolves #30552
What is the current behavior?
Something caused a timing shift in v8.6.0 that messed up the timing required for react router to set the active tab ID. Currently, when the router goes to set the tab ID, it's possibly too early and the tab may not exist yet, causing it to go unset.
What is the new behavior?
This PR is a workaround that allows tabs to check when they're rendered if a tab should be selected as a fallback for the router not setting them. I don't think the tabs, in the long run, should be responsible for this, but I think this is a good intermediate step until the upcoming react router upgrade, when we can look into a better solution for react router that may require less timing precision.
This PR also adds regression tests for React to make sure this doesn't happen again without getting noticed.
Does this introduce a breaking change?
Other information
Current dev build: