[Feature] sc-32261 Read GitHub PR info from env var

[kentwelcome]

PR checklist

• [x] Ensure you have added or ran the appropriate tests for your PR.
• [x] DCO signed

What type of PR is this? Feature

What this PR does / why we need it:

• Read GitHub PR info from GITHUB_PR_ID, GITHUB_PR_URL and GITHUB_PR_TITLE

Which issue(s) this PR fixes: sc-32261

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov[bot]]

Codecov Report

Merging #883 (0c0bfd2) into main (0a4839a) will increase coverage by 0.06%. The diff coverage is 76.47%.

@@            Coverage Diff             @@
##             main     #883      +/-   ##
==========================================
+ Coverage   46.41%   46.48%   +0.06%     
==========================================
  Files          75       75              
  Lines       10358    10365       +7     
==========================================
+ Hits         4808     4818      +10     
+ Misses       5550     5547       -3     

Files Changed	Coverage Δ
piperider_cli/cloud_connector.py	14.96% <0.00%> (+0.12%)	:arrow_up:
piperider_cli/githubutil.py	95.34% <90.90%> (-1.63%)	:arrow_down:
piperider_cli/compare_report.py	31.11% <100.00%> (+0.18%)	:arrow_up:

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