Remove deprecated 'gke' and 'gce' resource detectors after v0.54.0 is released

[dashpole]

The replacement is to use the single 'gcp' resource detector. See #10347.

[dashpole]

This is blocked by #12354. We should avoid removing the old detectors until we can resolve that open issue.

[github-actions]

Pinging code owners: @jrcamp @Aneurysm9 @dashpole. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• processor/resourcedetection: @jrcamp @Aneurysm9 @dashpole

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[jpkrohling]

@jrcamp @Aneurysm9 @dashpole, is this still relevant?

[dashpole]

Yes, this is still relevant.