move to use new conditions DB (71x branch)

This PR replaces #4003 which got a bit messed up when I tried to update to the latest GTs from #4123.

As discussed in the last ORP meeting, here is the PR to move to use the new Conditions DB.

This PR changes the default connection string for GTs in the PoolDBESSource to the new DB and it removes the "::All" part of the GT names in AlCa/autoCond.py.

Some of the "hand-crafted GTs" in AlCa/autoCond.py (notably the ones related to HLT and online) will be using a "mix", reading the "main GT" part from the new DB while picking the "overrides" from the old DB for now. This will be fixed in a future PR.

The full matrix was run and showed only 3 failing workflows with errors unrelated to the conditions.