Update the moderation policy to OpenJS escalation path, have TSC handle TSC reports

[mcollina]

This change updates the escalation path from an 8-year-old process defined in the Node.js Foundation era to what was agreed to when the OpenJS Foundation was established. We should have done it long ago, but we forgot to update this one.

I took the occasion to remove the moderation-review label and directly upstream the problem of escalation to the OpenJS CoC Team. Alternatively, we could have an internal appeal process plus the OpenJS appeal process.

I've also changed the verbiage to have the TSC self-moderate.

The current set of documents from OpenJS can be found at https://github.com/openjs-foundation/cross-project-council/blob/main/conduct/COC_POLICY.md#escalation.

[mcollina]

cc @nodejs/tsc

[jasnell]

One small suggestion. Otherwise LGTM

[mcollina]

Adjusted to follow @tobie clarification in #990 (comment).

[mcollina]

I think this is ready. Please review.

[tobie]

LGTM

[joyeecheung]

LGTM. Thanks for opening openjs-foundation/cross-project-council#1522 - I think that captures what I noticed very well.