Fix importVM for use with dummy template

[abh1sar]

Description

This PR fixes the Unable to find template with id 202 for virtual machine import error thrown when importing a VM.
The dummy template VM Import Default Template is stored in the removed state, so findById returns null and importVM fails.

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?

Tested ImportVmCmd with and without the fix

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.98%. Comparing base (a8c8c18) to head (0cb24ba).

Files with missing lines	Patch %	Lines
.../src/main/java/com/cloud/vm/UserVmManagerImpl.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               4.22   #14195   +/-   ##
=========================================
  Coverage     17.97%   17.98%           
- Complexity    16184    16186    +2     
=========================================
  Files          5930     5930           
  Lines        535615   535614    -1     
  Branches      65582    65582           
=========================================
+ Hits          96271    96304   +33     
+ Misses       428377   428336   -41     
- Partials      10967    10974    +7     

Flag	Coverage Δ
uitests	4.02% <ø> (ø)
unittests	19.05% <0.00%> (+<0.01%)	⬆️

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[weizhouapache]

code lgtm

need re-testing