feat: Align start time when the query is received

[DylanGuedes]

What this PR does / why we need it:
This fixes the approach of #20904: Since we were mismatching the new query engine results by not aligning the start timestamp, I implemented an alignment in the planner. On this PR I'm changing the approach to instead do the same procedure we do in the classic engine: I'm changing the query handler to wrap the StepAlignMiddleware instead. This should make the results of classic and new engine identical regarding how they handle step alignment.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[github-actions]

💻 Deploy preview deleted (feat: Align start time when the query is received).

[rfratto]

Can you add a new unit test for this so we don't regress? 🙏

[DylanGuedes]

Can you add a new unit test for this so we don't regress? 🙏

absolutely!

[rfratto]

Thanks! It might be a good idea to double check with @ashwanthgoli that it's correct to remove the unit tests you took out here

[DylanGuedes]

Thanks! It might be a good idea to double check with @ashwanthgoli that it's correct to remove the unit tests you took out here

thanks! I'm proceeding with the merge then, the unit tests I'm removing were added by me on #20904. On this PR I'm basically reverting doing the alignment at the engine level to do at the handler level instead (which is how we do in classic Loki).