Trim the 6.2 workflows

[johnbillion]

Previously: #10165

• The reusable workflow files have already been removed from this branch.
• This additionally pins the e2e test workflow to PHP 8.2 as they fail on latest (which is 8.3) in this branch.

Trac ticket: https://core.trac.wordpress.org/ticket/64083

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[desrosj]

I know we discussed pinning E2E tests for all old branches to a specific PHP version in Slack the other day, but don't recall if a public ticket was created or the discussion was summarized somewhere.

May be worth creating one before committing this so it can be mentioned as See in the commit message, and then the newer branches can also be updated.

[johnbillion]

https://core.trac.wordpress.org/changeset/61805