Deploy Promtail on AWS vintage installations

[TheoBrigitte]

Towards: #311
Towards: #1840

Along with Loki we need to deploy Promtail on AWS vintage installations to actually gather logs.

This should be deployed on all AWS vintage installation but flamingo and bandicoot.

Promtail

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1. Deploy it via observability-bundle
2. Add support for extraObject in observability-bundle chart
3. Set config per installation config via extraObject

[QuentinBisson]

Fixed config a bit but promtail is deployed on gaia
https://github.com/giantswarm/config/blob/main/default/apps/logging-operator/configmap-values.yaml.template

[QuentinBisson]

Current status on gaia:

Had to prevent loki backend to run on control plane nodes using node affinity (we probably want to have that by by default though) https://github.com/giantswarm/config/blob/a0c560715675e86b1b5b0fe6dcfa0e35e1504fa5/default/apps/loki/configmap-values.yaml.template#L41

Promtail is deployed with some stuck in pending (related to cpu usage, to investigate).

Logs are now sent to loki once I restarted the proxy

[QuentinBisson]

Restarting the proxy fixed it :)

[QuentinBisson]

All that's left is to enable it on all aws vintage installations

[TheoBrigitte]

Promtail is now deployed via logging-operator and this was tested and works with the logging.enabled flag.