Allow to set host network and tolerations for networking extension calico

[ScheererJ]

How to categorize this PR?

/area networking
/kind enhancement

What this PR does / why we need it:

Allow to set host network and tolerations for networking extension calico.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Host network and tolerations can now be specified as helm values for the networking calico extension.

[gardener-prow]

@ScheererJ: 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-extension-networking-calico-check-renovate-config	b61df4d	link	true	/test pull-gardener-extension-networking-calico-check-renovate-config

Full PR test history. Your PR dashboard. Command help for this repository.
Please help us cut down on flakes by linking this test failure to an open flake report or filing a new flake report if you can't find an existing one. Also see our testing guideline for how to avoid and hunt flakes.

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[gardener-robot]

@ScheererJ You need rebase this pull request with latest master branch. Please check.