Remove modularized eventing content

[grischperl]

Description

Remove eventing content that has already been modularized.

Changes proposed in this pull request:

• Remove left-over documentation and links
• Remove code ownership
• Remove eventing component

Related issue(s)

#18440

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[kyma-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

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[grischperl]

/test pull-event-publisher-proxy-unit-test

[kyma-bot]

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

Test name	Commit	Details	Required	Rerun command
pre-main-kyma-gardener-gcp-eventing	4dc537d	link	true	/test pre-main-kyma-gardener-gcp-eventing
pre-main-kyma-gardener-gcp-eventing-upgrade	4dc537d	link	true	/test pre-main-kyma-gardener-gcp-eventing-upgrade

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