[release-1.19] Prune stale HTTPRoutes when tags are removed from Ingress rules

[knative-prow-robot]

This is an automated cherry-pick of #894

Fix a bug where HTTPRoutes could remain after tags were removed. Stale routes are now deleted during reconciliation.

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, knative-prow-robot

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[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.38%. Comparing base (db2dbaf) to head (ddc74e3).
⚠️ Report is 1 commits behind head on release-1.19.

Files with missing lines	Patch %	Lines
pkg/reconciler/ingress/ingress.go	66.66%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.19     #902      +/-   ##
================================================
- Coverage         76.58%   76.38%   -0.20%     
================================================
  Files                17       17              
  Lines              1580     1266     -314     
================================================
- Hits               1210      967     -243     
+ Misses              336      263      -73     
- Partials             34       36       +2     

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[dprotaso]

/override "codecov/patch"

[knative-prow]

@dprotaso: Overrode contexts on behalf of dprotaso: codecov/patch

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In response to this:

/override "codecov/patch"

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