Enabled tracing/logging/metrics in gitlab source

[slinkydeveloper]

Fixes #1197

Now Gitlab source correctly follows logging/tracing/metrics config from the various config maps

This also updates eventing

Release Note

Now GitLab source implementation picks configuration for tracing/logging/metrics from config maps config-tracing/config-logging/config-observability, defaulting to no-op if they're not found

[knative-prow-robot]

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[googlebot]

CLAs look good, thanks!

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[slinkydeveloper]

Waiting for knative/eventing#3102

[mattmoor]

Produced via:
gofmt -s -w $(find -path './vendor' -prune -o -path './third_party' -prune -o -type f -name '*.go' -print)

[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

Note to project maintainer: There may be cases where the author cannot leave a comment, or the comment is not properly detected as consent. In those cases, you can manually confirm consent of the commit author(s), and set the cla label to yes (if enabled on your project).

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[googlebot]

CLAs look good, thanks!

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[antoineco]

/lgtm

[knative-prow-robot]

@slinkydeveloper: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-knative-eventing-contrib-build-tests	ceb6a22	link	/test pull-knative-eventing-contrib-build-tests

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