Clean up temp directory

[AswathySK]

The current cleanup script only removes temporary files from the /tmp directory, which is insufficient for Windows machines running Jenkins agents. Some Windows machines are getting disconnected due to low disk space. Upon investigation, it was found that C:\temp (or the directory specified by the TEMP environment variable) accumulates around 75GB of data, causing disk space exhaustion.

To resolve this, the cleanup script needs to be enhanced to include commands for clearing files from C:\temp or the machine’s designated TEMP directory. This will help prevent disconnections and ensure consistent performance of Jenkins agents by freeing up disk space
#https://github.ibm.com/runtimes/infrastructure/issues/10482

[keithc-ca]

I think this should use the relevant environment variable(s) (e.g. TEMP mentioned in the description) instead of hard-coding that path.

[AswathySK]

@keithc-ca I have made the correction. Can I go ahead and squash the commits?

[keithc-ca]

I don't expect tempDir is accessible here; it should be defined here.
Variable references should use ${}.
Double-quotes don't nest (on line 169).
I suggest we need to supply a default for TEMP:

                                        def tempDir = "${env.TEMP}" ?: "/cygdrive/c/temp"
                                        // convert to unix path
                                        tempDir = sh(script: "cygpath -u '${tempDir}'", returnStdout: true).trim()
                                        cleanDirsStr += " ${tempDir}/${cleanDirs.join(' ${tempDir}/')}"

[keithc-ca]

Please rebase to avoid implicit merges (e.g. with #23311).