Repo Gardening: Attempt to Fix OSS Workflow

[Aurorum]

Proposed changes:

Tests from non-a12ns currently immediately fail - eg. #37251

main: Starting task flagOss
Error: main: Task flagOss failed with error: HttpError: User does not exist or is not a public member of the organization - https://docs.github.com/rest/orgs/members#check-public-organization-membership-for-a-user

I think it should be okay if the check is wrapped in a try statement rather than assuming it won't error? Seems like the error is intentional.

Jetpack product discussion

N/A.

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

Not sure this is possible for an OSS citizen to actually test, so would appreciate some eyes on whether this seems logical.

cc @jeherve - sorry, assuming that you won't be notified unless I ping you until this is fixed.

[github-actions]

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[jeherve]

This tests well, thank you for the contribution!