Add sig/pm label to SIG list

[nikhita]

In the sig list, the current label for sig-product-management is "none". This is:

1. well, incorrect. :)
2. renders wrongly generated code in sig-product-management/README.md.

This PR updates the label as sig/pm.

Currently, we don't have sig/pm in the list of labels in the label configuration in test-infra. Also, the bot command /sig pm doesn't work.

See kubernetes/test-infra#8336 which adds the label to the label configuration and allows the bot command to work. I think we should put an explicit hold on this PR until kubernetes/test-infra#8336 is merged.
/hold

/cc cblecker idvoretskyi justaugustus

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[nikhita]

Oh well, sig/pm was automatically added here. :)

[nikhita]

Oh well, sig/pm was automatically added here. :)

That's due to https://github.com/kubernetes/community/blob/master/sig-product-management/OWNERS#L5

[justaugustus]

/lgtm

[idvoretskyi]

/lgtm

[idvoretskyi]

/hold cancel

[idvoretskyi]

@nikhita can you please update the PR?

It could be broken by #2068

[cblecker]

This was completely obsoleted by #2068 :)
/close

[nikhita]

This was completely obsoleted by #2068 :)

oops, should have checked the open PRs first 🤦‍♀️