PMM-7 update percona-platform URLs

[BupycHuk]

PMM-7

Link to the Feature Build: SUBMODULES-0

If this PR adds or removes or alters one or more API endpoints, please review and add or update the relevant API documents as well:

• [ ] API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[JiriCtvrtka]

Seems on problem with go modules

[artemgavrilov]

Hm, in fact we broke all PMM builds. There will be no way to build old PMM version, because there is no more percona-platform dependencies.

[BupycHuk]

@artemgavrilov it keeps working because of redirection on github side

[artemgavrilov]

@artemgavrilov it keeps working because of redirection on github side

go: github.com/percona/[email protected]: parsing go.mod:
	module declares its path as: github.com/percona-platform/dbaas-api
	        but was required as: github.com/percona/dbaas-api
Error: Process completed with exit code 1.

[BupycHuk]

There will be no way to build old PMM version

I'll improve this PR to use replace in go.mod instead of changing imports