Remove obsolete qsub_build.sh script

[harshagr70]

Description

This PR removes the qsub_build.sh script from the repository as it has been determined to be obsolete and no longer in active use.

fixes

fixes #3133

Types of changes

I have removed the script - qsub_build.sh that was no longer in use.

Checklist:

1. limited activity in logs - the logs show only a few reference to scripts/qsuib_build.sh which suggests that its not frequently used and updates
2. no direct reference - i found no direct reference for the script and also found no functions calling for the script , also checked for the workflow files but found no direct reference to the script .
3. also i have checked for the script as mentioned in the comment - referring to docker/depends/pecan.depends.R , this script caters the same functionality as of the qsuib_build.sh .
4. I found no reference or any detail about the script in the documentation .
5. The last commits made to that script was about 9 years ago and since its not maintained and updated , the script currently do not caters the requirements of installing the dependencies .

Concluding all these points its evident that the script is no longer in use hence its completely safe to remove the script .

[infotroph]

Thank you for doing the PR and especially for documenting the reasoning so thoroughly! I agree this can go and don't know of any other files that need to change because of it.

[harshagr70]

thank you !! @infotroph for reviewing and merging the changes !