feat(fs_scratchdirs): new service fs_scratchdirs

Description

feat(fs_scratchdirs): new service fs_scratchdirs

• extension of fs_scratch/fs_scratch_local
• uses new attributes which include different UMASKs for different directories
• generates only one gen file instead of 2 like fs_scratch/fs_scratch_local

How to test

Detailed process in task description

Author's checklist

• I have followed the contribution guidelines
• This MR has been tested or does not change functionality
• I have added relevant merge request dependencies (if this MR has any)
• I have added the correct labels
• I have assigned reviewers (if any are relevant)
• I have edited the documentation (if the changes require it) or I have noted the need for the change if I do not have access to the documentation
• I have marked all introduced BREAKING CHANGES or necessary DEPLOYMENT NOTES in the commit message(s)

Reviewer's checklist

• This MR has been tested or does not change functionality
• This MR has correct commit message format

Other information

None

Related issues

Closes STR-1297