migrate prometheus exporter roles

update grafana 10.1.4 -> 10.1.5

Update Admin-API link

the old one is deprecated (says the page at the link target), and refers to this new one.

Warning Borg users before upgrading to Postgres 16

no postgres 16 support with borg, 15 works.

Update synapse v1.93.0 -> v1.94.0

Self-build now requires the new docker buildx/buildkit, so switch
from the ansible docker module to running a docker build command,
like elsewhere.

Without explicitly passing the `media_url` configuration,
Heisenbridge would try to guess it. It works most of the time,
but some people are experiencing trouble with it.

There's no need for wasteful work and for potential unreliability,
so we now configure the `media_url` explicitly.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2932

Update prometheus 2.47.0 -> 2.47.1

Document how to enable Draupnir report polling

Fix link in Draupnir docs

Patch contributed by JulianF.

Update borg 1.2.5 -> 1.2.6

add matrix_synapse_oidc_enabled and matrix_synapse_oidc_providers vars

add `ensure-users-created` tag alongside with `ensure-matrix-users-created`

Seems like we don't necessarily need to use a public URL for `SYNCV3_SERVER`.

This possibly helps setups that were having trouble when `SYNCV3_SERVER`
was a public URL (e.g. `https://matrix.DOMAIN`), as described in:
https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2912

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2923

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2924

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/2922

Update docker role (sic!)

Update grafana v10.1.2 -> v10.1.4

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2919