Allow Rack :untraced_endpoints to include Regexp

[johnnyshields]

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: johnnyshields / name: Johnny Shields (8935cb9c9b71bb9dfecd3e80632f83173743b5b1, 38df2cf00cd1819a0e6f53a9ba276e6b3ae31ea1, 78cf8f7e767427f6cf0062fc346f9c1d035dde18, 7c8b59d410b53c2c90f22b8403b1f6760144b341, 50096a3a6a7517d12991913c2330e45cbaa146e2)
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[github-actions[bot]]

👋 This pull request has been marked as stale because it has been open with no activity. You can: comment on the issue or remove the stale label to hold stale off for a while, add the keep label to hold stale off permanently, or do nothing. If you do nothing this pull request will be closed eventually by the stale bot

[kaylareopelle]

Hi @johnnyshields! Thanks for re-requesting a review on this PR. We're slowly trying to catch up on PRs that've been open for a long time.

@ahayworth, @fbogsany, @robertlaurin - Have your concerns been resolved?

[kaylareopelle]

cc @open-telemetry/ruby-contrib-approvers and @open-telemetry/ruby-contrib-maintainers - please take a look if you're able!

[arielvalentin]

Adding some additional work to this PR.

This instrumentation now defaults to using Rack::Events as opposed to the classic middleware and will also need to be updated to support this option.

https://github.com/open-telemetry/opentelemetry-ruby-contrib/tree/main/instrumentation/rack#rack-middleware-vs-rack-events

[github-actions[bot]]

👋 This pull request has been marked as stale because it has been open with no activity. You can: comment on the issue or remove the stale label to hold stale off for a while, add the keep label to hold stale off permanently, or do nothing. If you do nothing this pull request will be closed eventually by the stale bot