ui: show selected template hypervisor in deploy form

[Dogface2k]

Summary

Fixes #13786.

Selecting a template could leave the Deploy VM form using the initial zone hypervisor. The displayed hypervisor and related form state could therefore be incorrect when the selected template used a different hypervisor.

The deploy form now follows the hypervisor metadata of the selected template.

Changes

• Update the form hypervisor when the template selection changes.
• Reconcile a preselected template after asynchronous template lists finish loading.
• Retain the existing zone hypervisor when the selected template is unavailable or has no hypervisor metadata.
• Preserve the existing ISO, volume, and snapshot selection behavior.
• Add focused regression coverage for KVM, XenServer, VMware, External, fallback behavior, and asynchronous preselection.

Template deployment request behavior is unchanged. The fix updates the existing form state and does not add a separate hypervisor parameter to template deployment requests.

Validation

Validated exact head 535dc17c579cbed705e7f34e06a1d343fc446641 against Apache 4.22 base 532852824a9729ff9f073e3678d9d0bd8afeb059.

• Focused regression suite: 8 passed.
• Sensitivity check against the unfixed base: 5 of 8 tests failed for the intended stale-hypervisor behavior.
• Full UI unit suite: 183 passed.
• UI lint: passed.
• Production UI build: passed with Node 16.20.2 and npm 8.19.4, matching the repository UI workflow runtime.
• QA-JID-974 evidence: a real ready External template was preselected and the deploy review displayed External instead of the zone value.

[shwstppr]

@blueorangutan ui

[blueorangutan]

@shwstppr a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: ✔️
Live QA URL: https://qa.cloudstack.cloud/simulator/pr/13813 (QA-JID-973)

[Dogface2k]

@blueorangutan ui

Please build the exact current PR head for final validation: 535dc17c579cbed705e7f34e06a1d343fc446641.

[blueorangutan]

@Dogface2k a Jenkins job has been kicked to build UI QA env. I'll keep you posted as I make progress.

[blueorangutan]

UI build: ✔️
Live QA URL: https://qa.cloudstack.cloud/simulator/pr/13813 (QA-JID-974)

[Dogface2k]

Validated exact head 535dc17c579cbed705e7f34e06a1d343fc446641 on QA-JID-974.

Using a real ready External template, the deploy flow preselected QA simulator UI fixture - External hypervisor (PR 13813) and displayed its External hypervisor.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 17.70%. Comparing base (5328528) to head (535dc17).

Additional details and impacted files

@@            Coverage Diff            @@
##               4.22   #13813   +/-   ##
=========================================
  Coverage     17.69%   17.70%           
+ Complexity    15835    15831    -4     
=========================================
  Files          5925     5925           
  Lines        533539   533549   +10     
  Branches      65274    65277    +3     
=========================================
+ Hits          94427    94482   +55     
+ Misses       428435   428381   -54     
- Partials      10677    10686    +9     

Flag	Coverage Δ
uitests	3.89% <ø> (+0.20%)	⬆️
unittests	18.77% <ø> (-0.01%)	⬇️

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