[User Story] - notation push signatures

[dtzar]

As a user, I want to push signatures into remote registry, using tag or digest references

Note: decision by group to push past RC-1, since notation sign does push automatically, and this really becomes more relevant once signing local artifacts is enabled.

• Update notation push command #232

[yizha1]

As discussed in the community meeting on Nov 4, 2024, move this issue to the future milestone