Add OTel resource attribute promotion feature

[aknuds1]

What this PR does

Add support for promoting OTel resource attributes.

The flag -distributor.promote-otel-resource-attributes (also a runtime config parameter) controls which set of resource attributes to eventually promote.

Additionally, OTelResourceAttributePromotionConfig can be set on the distributor configuration in order to specialize the configuration of which OTel resource attributes to promote. This is intended for our enterprise product.

Which issue(s) this PR fixes or relates to

Checklist

• Tests updated.
• Documentation added.
• CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX].
• about-versioning.md updated with experimental features.

[ying-jeanne]

Since we do label validation in validate.go validateLabels, check the number of label is less than the limit, if we convert resource attribute, we need to exclude those from numLabelNames

if numLabelNames > cfg.MaxLabelNamesPerSeries(userID) {
		m.maxLabelNamesPerSeries.WithLabelValues(userID, group).Inc()
		metric, ellipsis := getMetricAndEllipsis(ls)
		return fmt.Errorf(tooManyLabelsMsgFormat, len(ls), cfg.MaxLabelNamesPerSeries(userID), metric, ellipsis)
	}

[ying-jeanne]

pushed a couple of tests on the blessing attributes, and a discussion about how to put lable limits

[aknuds1]

Since we do label validation in validate.go validateLabels, check the number of label is less than the limit, if we convert resource attribute, we need to exclude those from numLabelNames

@ying-jeanne we probably want to align with Loki, which includes the promoted attributes when comparing against the label count limit.

[dimitarvdimitrov]

The CHANGELOG has just been cut to prepare for the next Mimir release. Please rebase main and eventually move the CHANGELOG entry added / updated in this PR to the top of the CHANGELOG document. Thanks!

[jesusvazquez]

LGTM!

[56quarters]

LGTM with some small changes that I'd like you to take a look at.