Reland "[Product specifications] Add enterprise policy"

This reverts commit de47a3bb.

Reason for revert: tools/traffic_annotation/scripts/auditor/auditor.py script fails by this change.

Original change's description:
> Revert "[Product specifications] Add enterprise policy"
>
> This reverts commit 259f96f2.
>
> Reason for revert: Policy format and name incorrect for feature
>
> Original change's description:
> > [Product specifications] Add enterprise policy
> >
> > This patch adds the declaration for the enterprise policy for product
> > specifications. The policy is not checked anywhere yet, but is needed
> > for network annotation definitions in subsequent patches.
> >
> > Bug: b:325109916
> > Change-Id: If3191068904cbf22449183db63d463d1426be2d1
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5297236


> > Commit-Queue: Matthew Jones <mdjones@chromium.org>
> > Reviewed-by: Pavol Marko <pmarko@chromium.org>
> > Reviewed-by: Sébastien Lalancette <seblalancette@chromium.org>
> > Cr-Commit-Position: refs/heads/main@{#1265934}
>
> BYPASS_POLICY_COMPATIBILITY_CHECK=Policy never launched in-code
>
> Bug: b:325109916
> Change-Id: I0e12808c00dc1804f212d5443f8356e556209032
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5405992


> Reviewed-by: Owen Min <zmin@chromium.org>
> Commit-Queue: Matthew Jones <mdjones@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1282148}

Bug: b:325109916
Change-Id: I5f8a4d69209e1f273dcf070f8c60acaf0c5f35f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5426630


Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Auto-Submit: Shunya Shishido <sisidovski@chromium.org>
Commit-Queue: Shunya Shishido <sisidovski@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1282763}