When new push occurs, delete old remote pipeline

[tadgh]

• adds cancel handling logic to the compile-against-cdr job.
• ensures only one copy running per PR.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.79 🎉

Comparison is base (2f5ffe7) 81.32% compared to head (74716c1) 83.12%.

❗ Current head 74716c1 differs from pull request most recent head df9f934. Consider uploading reports for the commit df9f934 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4864      +/-   ##
============================================
+ Coverage     81.32%   83.12%   +1.79%     
- Complexity    23650    25290    +1640     
============================================
  Files          1425     1542     +117     
  Lines         86399    92277    +5878     
  Branches      11677    12313     +636     
============================================
+ Hits          70265    76706    +6441     
+ Misses        10947    10139     -808     
- Partials       5187     5432     +245     

see 1501 files with indirect coverage changes

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