Updating the NimbusReactiveJwtDecoder.JwkSetUriReactiveJwtDecoderBuil…

[meverden]

…der processor to execute the ConfigurableJWTProcessor customizations before holding a reference to the JWSKeySelector.

Creating a PR to address #12960

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[jzheaux]

Thanks, @meverden! The PR looks great. Will you please do the following house-keeping items in your PR?

1. Please rebase off of 5.7.x so that all active branches get the fix
2. Please format your commit to something more like this:

Delay JWSVerificationKeySelector Construction

<< any other commentary needed >>

Closes gh-12960

3. Please update the copyright date on any files that you edit (the test file should now say 2023 as the end date)
4. Once ready, please squash any commits into a single one

[meverden]

@jzheaux, this branch is now based off 5.7.x, copyright dates have been updated in all locations, commit message has been reformatted and squashed.

[jzheaux]

Thanks, @meverden, for the PR! This is now merged into 5.7.x, 5.8.x, 6.0.x, and main.