Cygwin: Bash build and testing

[Blackhex]

Description

• Integrate build of bash.exe achieved in Cygwin: Experimental bash.exe build capable of executing git clone #245 into advanced.yml.
• Add running of bash.exe tests, the tests can fail and the failure may be ignored.

Acceptance Criteria

• The build of bash.exe is integrated into advanced.yml.
• The bash.exe tests are being run with daily rebases workflow.

[eukarpov]

Bash build has been added to CI and all required workarounds have been merged to bash and cygwin repos.
#309
Windows-on-ARM-Experiments/bash#1
Windows-on-ARM-Experiments/newlib-cygwin#16