TKR Resolver: exact TKR version match (if exists) should be the only result

[imikushin]

What this PR does / why we need it

When the exact TKR version is specified as the version prefix AND such TKR exists, it should be the only result in the returned resolution result set.

This fixes a problem, where there are TKRs whose versions are longer than the provided exactly matching TKR version.

For example, the provided prefix is v1.22.13+vmware.1-tkg.1. There are two TKRs with versions satisfying this version prefix:

• v1.22.13+vmware.1-tkg.1,
• v1.22.13+vmware.1-tkg.1-zshippable.

Of the above two, v1.22.13+vmware.1-tkg.1 must be used, because it is the exact match, and is least surprising for the user specifying v1.22.13+vmware.1-tkg.1 as the version prefix.

Which issue(s) this PR fixes

Fixes #4262

Describe testing done for PR

Updated unit tests with the test case exposing the issue.

Release note

Fixed a problem when resolving TKRs, where there are TKRs whose versions are longer 
than the matching TKR's version.

For example, the provided version prefix is `v1.22.13+vmware.1-tkg.1`. There are two TKRs 
with versions satisfying this prefix:
- `v1.22.13+vmware.1-tkg.1`,
- `v1.22.13+vmware.1-tkg.1-zshippable`.

Of the above, `v1.22.13+vmware.1-tkg.1` will now be returned, because it is the exact match. 
When the version prefix is shorter (e.g. `v1.22.13+vmware.1`), the result will still be 
`v1.22.13+vmware.1-tkg.1-zshippable` because it is considered a "more recent" version from 
the alpha-numerical comparison point of view.

Additional information

Special notes for your reviewer

[codecov]

Codecov Report

Merging #4271 (42c2bd9) into main (f39341f) will decrease coverage by 0.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4271      +/-   ##
==========================================
- Coverage   49.40%   48.50%   -0.91%     
==========================================
  Files         451      481      +30     
  Lines       44755    46875    +2120     
==========================================
+ Hits        22111    22736     +625     
- Misses      20560    22003    +1443     
- Partials     2084     2136      +52     

Impacted Files	Coverage Δ
addons/controllers/machine_controller.go	65.65% <0.00%> (-3.04%)	⬇️
cmd/cli/plugin/isolated-cluster/main.go	0.00% <0.00%> (ø)
...in/cluster/get_machinehealthcheck_control_plane.go	11.11% <0.00%> (ø)
...cluster/delete_machinehealthcheck_control_plane.go	16.66% <0.00%> (ø)
cmd/cli/plugin/cluster/create.go	42.22% <0.00%> (ø)
cmd/cli/plugin/cluster/kubeconfig_get.go	8.82% <0.00%> (ø)
cmd/cli/plugin/cluster/get_node_pools.go	10.52% <0.00%> (ø)
cmd/cli/plugin/cluster/list.go	11.36% <0.00%> (ø)
.../isolated-cluster/imgpkginterface/client_imgpkg.go	0.00% <0.00%> (ø)
cmd/cli/plugin/cluster/set_node_pool.go	14.63% <0.00%> (ø)
... and 22 more

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[prkalle]

LGTM. Thanks @imikushin!