server: add duplicate host check on addHost

[shwstppr]

Description

Fixes #13080

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

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.26%. Comparing base (a7c2a05) to head (bbc65d0).

Files with missing lines	Patch %	Lines
...n/java/com/cloud/resource/ResourceManagerImpl.java	71.42%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               4.20   #13177      +/-   ##
============================================
- Coverage     16.27%   16.26%   -0.01%     
+ Complexity    13440    13435       -5     
============================================
  Files          5665     5665              
  Lines        500555   500569      +14     
  Branches      60789    60791       +2     
============================================
- Hits          81445    81427      -18     
- Misses       410004   410034      +30     
- Partials       9106     9108       +2     

Flag	Coverage Δ
uitests	4.15% <ø> (ø)
unittests	17.12% <71.42%> (-0.01%)	⬇️

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[shwstppr]

@blueorangutan package

[blueorangutan]

@shwstppr a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.

[blueorangutan]

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 17889

[shwstppr]

Closign in favor #13182 as @vishesh92 has created his own solution now

[vishesh92]

Imported the commit from this PR in #13182 to throw early error on adding the host. Closing this PR.