Add glossary entry for cadvisor

[markusheinemann]

This PR introduces a new glossary entry for cadvisor. The glossary entry is used to explain this tool on the k8s.io/docs/concepts/architecture/garbage-collection/ page.

Resolves #30814

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[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Markus Heinemann (c2b31a0)

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[sftim]

/check-cla
/easycla

[sftim]

We're migrating between CLA-signing systems. Could you follow the advice in #30830 (comment) @markusheinemann ?

[linux-foundation-easycla]

• ❌ The commit (8a66eca) is missing the User's ID, preventing the EasyCLA check. Consult GitHub Help to resolve.For further assistance with EasyCLA, please submit a support request ticket.

[markusheinemann]

/check-cla
/easycla

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Markus Heinemann (a86ca5b)

[sftim]

@markusheinemann It's possible we don't have your GitHub username on record, or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits, matching an email address that GitHub recognizes as you.

[sftim]

https://help.github.com/en/github/committing-changes-to-your-project/why-are-my-commits-linked-to-the-wrong-user might help you fix that.

[markusheinemann]

Thanks for your support @sftim. Should be fine now 😃

[sftim]

/lgtm
/approve

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 48bdff484fc5c6277afaf9ba4814fc212a4d466d

[k8s-ci-robot]

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