Update versions and add release notes for v3.27.3 (projectcalico#8678)

* Add v3.27.3 release notes
* Update versions in charts
* Update manifests for v3.27.3/v1.32.7

Merge pull request projectcalico#8622 from projectcalico/build-v3.29

Begin development on v3.29.0

version updates for v3.27.2 release (projectcalico#8526)

Update calico and operator versions for release (projectcalico#8519)

Add manual GCR login for now (projectcalico#8341)

Quiet docker output; tag/push images in parallel

Begin development on v3.28.0

Updates for v3.26.3

Updates for v3.26.2

Updates for v3.25.2