Add queries for LOOKUP JOIN with filters on lookup table attributes

[luigidellaquila]

Adding some queries to ES|QL LOOKUP JOIN tracks, to test WHERE filters on attributes coming from the lookup tables, eg.

FROM join_base_idx 
| lookup join lookup_idx 
| where lookup_keyword == "foo"

[inqueue]

LGTM

[esbenchmachine]

@luigidellaquila
A backport is pending for this PR. Please add all required vX.Y version labels.

• If it is intended for the current Elasticsearch release version, apply the corresponding version label.
• If it also supports past released versions, add those labels too.
• If it only targets a future version, wait until that version label exists and then add it.
  (Each rally-tracks version label is created during the feature freeze of a new Elasticsearch branch).

Backporting entails:

1. Ensure the correct version labels exist in this PR.
2. Ensure backport PRs have backport label and are passing tests.
3. Merge backport PRs (you can approve yourself and enable auto-merge).
4. Remove backport pending label from this PR once all backport PRs are merged.

Thank you!