Adapt high-availability configuration of shoot control plane components

[rfranzke]

How to categorize this PR?

/area high-availability
/kind enhancement

What this PR does / why we need it:
This PR adapts the HA configuration of the non-observability-related shoot control plane components.
Concretely, the components are labeled according to their type and custom replica/affinity changes have been dropped.
The webhook introduced with #6967 will take care to properly inject the required HA configuration.

Which issue(s) this PR fixes:
Part of #6529
Similar to #6982 and #6989

Special notes for your reviewer:
✅ Depends on #6967 which needs to be merged first.

/cc @timuthy

Release note:

All non-observability-related shoot control plane components are now running with configuration for high-availability according to [the conventions](https://github.com/gardener/gardener/blob/master/docs/development/high-availability.md).

[gardener-prow]

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[gardener-prow]

@rfranzke: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-gardener-apidiff	3c859ac	link	false	/test pull-gardener-apidiff

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[timuthy]

Thank you 🙂
/lgtm
/approve

[gardener-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: timuthy

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[acumino]

/cc @rfranzke is this supposed to go in v1.60?

[timuthy]

@acumino it'd be nice to have this in v1.60 🙂

[acumino]

/milestone v1.60