fix : AuthConfigList is populated with from images during buildx push as well

[rohanKanojia]

Description

Fix #1709

• During BuildX push we also need credentials for pulling base images used in Dockerfile. Sending a single AuthConfig just for push registry will not work.
• Refactor code in BuildMojo to extract AuthConfig for base images used in Build configuration / Dockerfile . Move common logic as static methods in RegistryService so that it can be reused in both build and push goals.

[codecov]

Codecov Report

Merging #1751 (4935994) into master (f58346e) will increase coverage by 0.02%.
The diff coverage is 89.58%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1751      +/-   ##
============================================
+ Coverage     65.73%   65.76%   +0.02%     
- Complexity     2290     2294       +4     
============================================
  Files           172      172              
  Lines         10184    10184              
  Branches       1405     1405              
============================================
+ Hits           6694     6697       +3     
+ Misses         2936     2934       -2     
+ Partials        554      553       -1     

Files	Coverage Δ
...fabric8/maven/docker/AbstractBuildSupportMojo.java	100.00% <ø> (ø)
...va/io/fabric8/maven/docker/AbstractDockerMojo.java	58.89% <100.00%> (+0.25%)	⬆️
...c/main/java/io/fabric8/maven/docker/BuildMojo.java	34.52% <100.00%> (-16.27%)	⬇️
...rc/main/java/io/fabric8/maven/docker/PushMojo.java	53.84% <100.00%> (ø)
.../fabric8/maven/docker/service/RegistryService.java	83.20% <88.88%> (+2.47%)	⬆️

... and 1 file with indirect coverage changes

[sonarqubecloud]

Quality Gate passed

Issues
8 New issues

Measures
0 Security Hotspots
92.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud