Skip sending DFIU PRs to repos added to an exclusion list

[avimanyum]

This change introduces a new flag that can be passed to the DFIU tool while invoking the All subcommand. This flag indicates the list of repositories that need to be excluded when DFIU starts sending out PRs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a21d7b6) 85.69% compared to head (0ebc412) 85.80%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1127      +/-   ##
============================================
+ Coverage     85.69%   85.80%   +0.11%     
- Complexity      385      387       +2     
============================================
  Files            27       27              
  Lines          1272     1282      +10     
  Branches        165      166       +1     
============================================
+ Hits           1090     1100      +10     
  Misses          146      146              
  Partials         36       36              

Files	Coverage Δ
.../salesforce/dockerfileimageupdate/CommandLine.java	76.47% <100.00%> (+0.71%)	⬆️
...ce/dockerfileimageupdate/subcommands/impl/All.java	89.85% <100.00%> (+0.14%)	⬆️
...esforce/dockerfileimageupdate/utils/Constants.java	100.00% <ø> (ø)
...orce/dockerfileimageupdate/utils/PullRequests.java	100.00% <100.00%> (ø)