Backport unified pipeline for APM SDKs for SSI artifacts (#5868)

## Summary of changes

This is a backport of #5818 to the 2.x release branch. The main
difference is that 2.x needs the init images for musl published under
the `-musl` tag suffix

## Reason for change

By using the unified pipeline across all APM libraries, there is less
maintenance hassle, fewer mistakes, and a more uniform creation of
artifacts.

## Implementation details

I kept all of the changes from the original PR isolated to a single
commit for ease of review. The goal of the changes was to do the minimal
without having to change `one-pipeline` upstream.

**download-single-step-artifacts.sh** : 
download the musl tarball from Github releases

**prepare-oci-package.sh** : 
if `LIBC` is `musl` use the `musl` tarball

**gitlab-ci.yml** :
* package-oci-musl : I couldn't change the `package-oci` matrix without
having dependency/artifact issues so a new job is created to build the
musl oci package. This package is only used to create the lib injection
image and the OCI package is not published anywhere
* create-arch-specific-lib-injection-image-musl: build the lib injection
image from package-oci-musl. The hack is that `ARCH` is abused to get
the tag to be `COMMIT_SHA-musl` . A multiach image is unneeded because
only amd64 supports musl and the single arch image is tagged correctly.
* generate-lib-init-pinned-tag-values : The `master` version overrode
one-pipeline to add `musl` tag to everything. That override is removed
* generate-lib-init-pinned-tag-values-musl: Generates the musl tags
* publish-lib-init-pinned-tags-musl : publishes the musl tags using
`COMMIT_SHA-musl` as the source

<!-- ⚠️ Note: where possible, please obtain 2 approvals prior to
merging. Unless CODEOWNERS specifies otherwise, for external teams it is
typically best to have one review from a team member, and one review
from apm-dotnet. Trivial changes do not require 2 reviews. -->

Author: randomanderson

.azure-pipelines/ultimate-pipeline.yml

@@ -3909,19 +3909,6 @@ stages:
         vmImage: ubuntu-latest
       steps:
       - checkout: none
-      - bash: |
-          echo "Creating dispatch event for https://github.com/DataDog/dd-trace-dotnet/actions/workflows/lib-injection.yml with ref=$(Build.SourceBranch) and azdo_build_id=$(Build.BuildId)"
-          curl \
-            -X POST \
-            -H "Accept: application/vnd.github+json" \
-            -H "Authorization: token $GITHUB_TOKEN"\
-            -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/DataDog/dd-trace-dotnet/actions/workflows/lib-injection.yml/dispatches \
-            -d '{"ref":"$(Build.SourceBranch)","inputs":{"azdo_build_id":"$(Build.BuildId)","is_latest":"$(isMainBranch)"}}'
-        displayName: Start lib-injection GitHub Actions worfklow
-        env:
-          GITHUB_TOKEN: $(GITHUB_TOKEN)
-
       - bash: |
           echo "Creating dispatch event for https://github.com/DataDog/dd-trace-dotnet/actions/workflows/create-system-test-docker-base-images.yml with ref=$(Build.SourceBranch) and azdo_build_id=$(Build.BuildId) and is_release_version=False"
           curl \

.github/workflows/create_draft_release.yml

@@ -8,24 +8,7 @@ on:
         required: false
 
 jobs:
-  lib-injection-image-test:
-    permissions:
-      contents: read
-      packages: write
-    strategy:
-      matrix:
-        runtime: ['bullseye-slim','alpine']
-      fail-fast: false
-    uses: ./.github/workflows/lib-injection-test.yml
-    with:
-      commit_id: ${{ github.event.inputs.forced_commit_id || github.sha }}
-      runtime: ${{ matrix.runtime }}
-    secrets:
-      DOCKER_REGISTRY_GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
   create_draft_release:
-    needs:
-      - lib-injection-image-test
     runs-on: ubuntu-latest
     env:
       GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"