build: skip sast coverity check

[TenSt]

This PR disables sast coverity check as it takes about 45m to run.
We will need to investigate how to configure it later to run faster and not block the pipeline.

Summary by Sourcery

Build:

• Configure Tekton pull-request and push pipelines to set skip-sast-coverity-check to true, disabling the Coverity SAST step.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Tekton pipeline configurations for both pull request and push workflows to skip the SAST Coverity check by default, reducing pipeline execution time.

File-Level Changes

Change	Details	Files
Enable skipping of the SAST Coverity check in both PR and push Tekton pipelines.	Set the skip-sast-coverity-check parameter value to "true" in the pull request pipeline spec. Set the skip-sast-coverity-check parameter value to "true" in the push pipeline spec.	.tekton/patchman-engine-pull-request.yaml .tekton/patchman-engine-push.yaml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Since this disables a security check globally, consider restricting the skip to specific branches or event types (e.g., only PRs) rather than both pull-request and push pipelines to reduce risk.
• It may be helpful to add an inline TODO or comment next to skip-sast-coverity-check: "true" in the Tekton YAML so the intent and temporary nature of this change are visible to anyone editing the pipeline later.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this disables a security check globally, consider restricting the skip to specific branches or event types (e.g., only PRs) rather than both pull-request and push pipelines to reduce risk.
- It may be helpful to add an inline TODO or comment next to `skip-sast-coverity-check: "true"` in the Tekton YAML so the intent and temporary nature of this change are visible to anyone editing the pipeline later.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.03%. Comparing base (5b3c61d) to head (2d4afb5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2248      +/-   ##
==========================================
- Coverage   59.06%   59.03%   -0.04%     
==========================================
  Files         138      138              
  Lines        8848     8848              
==========================================
- Hits         5226     5223       -3     
- Misses       3076     3079       +3     
  Partials      546      546              

Flag	Coverage Δ
unittests	59.03% <ø> (-0.04%)	⬇️

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