adjust tools/update_vendor.sh to use go.work, verify go.work and remove the symlink in vendor

[chrischdi]

As side-effect this also removes the symlink in vendor used for providers, because go work tidy does not create it anymore.

We were building cloud-provider-gcp in a hermetic environment which always tries to rebuild vendor in a clean way.

This resulted in a diff, because it would not have applied the symlink workaround for providers.

This PR would add go.work and go.work.sum and makes use of go work vendor which results in not even vendoring the providers module.

Also ensures that all modules are always tidied.

Question to the maintainers: If this makes sense I'm happy to address further comments / get this merged. Otherwise I'm also fine with closing this if it is not considered worth it.

cc @theobarberbany

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[chrischdi]

/retest

[theobarberbany]

I think this makes sense, we're working using go modules/workspaces properly, and is nicer than special casing a symlink!

lgtm, but will wait to see what other maintainers think :)

[JoelSpeed]

Seems like a step in the right direction as far as I'm concerned

/assign @cheftako

I think Walter will be interested in this one

[JoelSpeed]

/lgtm

[theobarberbany]

/lgtm

[justinsb]

@theobarberbany and I discussed this in capg office hours :-)

k/k also checks in go.work & go.work.sum so I think we should follow that.

/approve
/lgtm

[cheftako]

/lgtm
/approve

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