Re-configure GitLab deployment jobs

[sarahchen6]

What Does This Do

Reconfigure Maven and GitHub deployment jobs to run after GitLab system-tests succeed.

Also introduce the new shared-pipeline stages from https://github.com/DataDog/libdatadog-build/pull/236.

Motivation

In release 1.63.1 where GitLab system-tests failed, Maven and GitHub artifacts were deployed while OCI artifacts were not because only OCI artifacts depended on system-tests success. Ensure that publishing steps occur in line with each other after system-tests succeed.

Additional Notes

Check the effects of the changes in this PR by going to the GitLab pipeline, clicking "Job dependencies" and toggling "Show dependencies" (https://gitlab.ddbuild.io/DataDog/apm-reliability/dd-trace-java/-/pipelines/121679382).

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Add your completed PR to the merge queue by commenting /merge. You can also:
  • Customize the commit message associated with the merge with /merge --commit-message "..."
  • Remove your PR from the merge queue with /merge -c
  • Skip all merge queue checks with /merge -f --reason "reason"; please use this judiciously, as some checks do not run at the PR-level (note: the PR still needs to be mergeable, this will only skip the pre-merge build)
  • Get more information in this doc

Jira ticket: [PROJ-IDENT]

[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.93 s	13.93 s	[-0.7%; +0.8%] (no difference)
startup:insecure-bank:tracing:Agent	12.90 s	13.04 s	[-1.9%; -0.2%] (maybe better)
startup:petclinic:appsec:Agent	16.99 s	16.87 s	[-0.5%; +2.0%] (no difference)
startup:petclinic:iast:Agent	16.98 s	17.06 s	[-1.4%; +0.5%] (no difference)
startup:petclinic:profiling:Agent	16.79 s	17.07 s	[-2.8%; -0.5%] (maybe better)
startup:petclinic:sca:Agent	17.06 s	16.72 s	[+1.2%; +2.8%] (significantly worse)
startup:petclinic:tracing:Agent	16.15 s	16.16 s	[-0.9%; +0.8%] (no difference)

Commit: e20d0fbd · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.