Collected small Jenkinsfile improvements

[pcf000]

1. catchError doesn't catch timeout exceptions, but try/catch does. Use try/catch in the codecov stage. This is a precursor to using "retry" to automatically catch and retry after infrastructure issues.
2. check-rocmlir-build-only with profiling on does make some *.profraw files. Delete them before check-rocmlir.
3. Use df to check for enough disk space before running codecov, because it'll generate around 125 GB of *.profraw files.
4. Abstract the bulk of the codecov shell script into a function.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.99%. Comparing base (82378ac) to head (2a50233).
Report is 10 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1686      +/-   ##
===========================================
- Coverage    78.00%   77.99%   -0.02%     
===========================================
  Files           98       98              
  Lines        26498    26498              
  Branches      3809     3809              
===========================================
- Hits         20671    20668       -3     
+ Misses        4311     4292      -19     
- Partials      1516     1538      +22     

Flag	Coverage Δ
mfma	77.99% <ø> (-0.02%)	⬇️

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[krzysz00]

Approved, thanks!