server: delete template from storage pools on delete

[shwstppr]

Description

Fixes #10688

WIP: To check/update what happens in a multi-zone env and template is deleted for a particular zone

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI
• test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 4.28%. Comparing base (1f8442e) to head (040a3ec).
Report is 7 commits behind head on 4.19.

❗ There is a different number of reports uploaded between BASE (1f8442e) and HEAD (040a3ec). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (1f8442e)	HEAD (040a3ec)
unittests	1	0

Additional details and impacted files

@@              Coverage Diff              @@
##               4.19   #10819       +/-   ##
=============================================
- Coverage     15.17%    4.28%   -10.89%     
=============================================
  Files          5414      371     -5043     
  Lines        475093    29700   -445393     
  Branches      57971     5211    -52760     
=============================================
- Hits          72086     1274    -70812     
+ Misses       394945    28281   -366664     
+ Partials       8062      145     -7917     

Flag	Coverage Δ
uitests	4.28% <ø> (ø)
unittests	?

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