feat(sdk): Add alpha env flag to opt out artifact tracking annotations

[Tomcli]

Which issue is resolved by this Pull Request:
Resolves #

Description of your changes:
Add alpha env flag to opt out artifact tracking annotations to further reduce Tekton yaml size for pipelines that need high throughputs without tracking.

Usage:
Enable the following env variable flag before compiling the pipeline

export DISABLE_ARTIFACT_TRACKING=true

Environment tested:

• Python Version (use python --version):
• Tekton Version (use tkn version):
• Kubernetes Version (use kubectl version):
• OS (e.g. from /etc/os-release):

Checklist:

• The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

[Tomcli]

/assign @yhwang

[yhwang]

/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Tomcli, yhwang

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