chore: remove deprecated flags for 3.0

[pmalek]

What this PR does / why we need it:

Remove previously deprecated flags for 3.0 release.

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

All modified lines are covered by tests ✅

Comparison is base (81f1a20) 77.7% compared to head (5e0d575) 77.7%.
Report is 8 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4770   +/-   ##
=====================================
  Coverage   77.7%   77.7%           
=====================================
  Files        163     163           
  Lines      18541   18520   -21     
=====================================
- Hits       14409   14408    -1     
+ Misses      3321    3307   -14     
+ Partials     811     805    -6     

Files	Coverage Δ
internal/manager/config.go	94.6% <ø> (-0.6%)	⬇️

... and 4 files with indirect coverage changes

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[pmalek]

For some reason the routes are not always in the same order in

kubernetes-ingress-controller/internal/dataplane/parser/parser_test.go

Lines 2942 to 2966 in 81f1a20

	assert.Equal(t, kong.Route{
	Name: kong.String("default.foo.foo-svc.example.com.80"),
	StripPath: kong.Bool(false),
	RegexPriority: kong.Int(0),
	ResponseBuffering: kong.Bool(true),
	RequestBuffering: kong.Bool(true),
	Hosts: kong.StringSlice("example.com"),
	PreserveHost: kong.Bool(true),
	Paths: kong.StringSlice("/"),
	Protocols: kong.StringSlice("http", "https"),
	ID: kong.String("99296cc1-ab30-59f8-b204-7b1a45e64cac"),
	}, state.Services[0].Routes[0].Route)
	assert.Equal(t, kong.Route{
	Name: kong.String("default.foo.foo-svc._.example.com.80"),
	StripPath: kong.Bool(false),
	RegexPriority: kong.Int(0),
	ResponseBuffering: kong.Bool(true),
	RequestBuffering: kong.Bool(true),
	Hosts: kong.StringSlice("*.example.com"),
	SNIs: nil,
	PreserveHost: kong.Bool(true),
	Paths: kong.StringSlice("/"),
	Protocols: kong.StringSlice("http", "https"),
	ID: kong.String("cbdfe994-15d4-5336-909a-e302ed66e19a"),
	}, state.Services[0].Routes[1].Route)

Should they be? 🤔

[pmalek]

For some reason the routes are not always in the same order in

kubernetes-ingress-controller/internal/dataplane/parser/parser_test.go

Lines 2942 to 2966 in 81f1a20

	assert.Equal(t, kong.Route{
	Name: kong.String("default.foo.foo-svc.example.com.80"),
	StripPath: kong.Bool(false),
	RegexPriority: kong.Int(0),
	ResponseBuffering: kong.Bool(true),
	RequestBuffering: kong.Bool(true),
	Hosts: kong.StringSlice("example.com"),
	PreserveHost: kong.Bool(true),
	Paths: kong.StringSlice("/"),
	Protocols: kong.StringSlice("http", "https"),
	ID: kong.String("99296cc1-ab30-59f8-b204-7b1a45e64cac"),
	}, state.Services[0].Routes[0].Route)
	assert.Equal(t, kong.Route{
	Name: kong.String("default.foo.foo-svc._.example.com.80"),
	StripPath: kong.Bool(false),
	RegexPriority: kong.Int(0),
	ResponseBuffering: kong.Bool(true),
	RequestBuffering: kong.Bool(true),
	Hosts: kong.StringSlice("*.example.com"),
	SNIs: nil,
	PreserveHost: kong.Bool(true),
	Paths: kong.StringSlice("/"),
	Protocols: kong.StringSlice("http", "https"),
	ID: kong.String("cbdfe994-15d4-5336-909a-e302ed66e19a"),
	}, state.Services[0].Routes[1].Route)

Should they be? 🤔

That will be handled in #4777 (or #4781)

[programmer04]

🧹