Removed equinix provider

[anshuman-agarwala]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug

/kind cleanup

/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
Removed equinix and weave providers as both are being/have been shuttered.
Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

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[VannTen]

/release-note-edit

contrib: removed Equinix Metal terraform support

[VannTen]

There is a network plugin for weave which should go as well.
Also contrib/ is not exactly supported so clearing that is not a problem but weave should should have a action required release note.

(and preferably in a separate PR, sorry, I hadn't noticed this file in the diff in the other ones).

[anshuman-agarwala]

I've removed the weave changes from here and created #12230 for handling weave network plugin removal, PTAL.

[VannTen]

/ok-to-test
/label ci-short

[VannTen]

You need to run pre-commit to regenerate the docs index but otherwise looks good.

[VannTen]

/lgtm /approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: anshuman-agarwala, VannTen

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