Backport(v2.12.x): fix(tests): skip upgrade tests if not upgrading between two consecuti…

[tao12345666333]

…ve Kong versions (#5327)

(cherry picked from commit 614c6c0)

What this PR does / why we need it:
#5257 (comment)

Which issue this PR fixes:

Special notes for your reviewer:

PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (b929f67) 68.0% compared to head (01ac100) 68.0%.
Report is 3 commits behind head on release/2.12.x.

Files	Patch %	Lines
internal/manager/run.go	44.4%	4 Missing and 1 partial ⚠️
internal/dataplane/deckgen/generate.go	66.6%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release/2.12.x   #5365     +/-   ##
================================================
- Coverage            68.0%   68.0%   -0.1%     
================================================
  Files                 165     165             
  Lines               19344   19352      +8     
================================================
+ Hits                13159   13163      +4     
- Misses               5397    5401      +4     
  Partials              788     788             

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[pmalek]

Just one nit wrt the PR: I'd suggest to include the target version (or branch) in the PR title so that it's obvious when looking at the PR list what this PR tried to achieve.

Ideally we'd also add this issue into the respective Milestone but that's minor thing.

[team-k8s-bot]

E2E (targeted) tests with KIND-based and GKE-based clusters were started at https://github.com/Kong/kubernetes-ingress-controller/actions/runs/7261609627