Update e2e config

[iliakur]

What does this PR do?

• Simpler e2e environment definition.
• DRY: move documentation about different envs from test README into hatch.toml.

Motivation

Drive-by: was looking into Teradata failures on CI and noticed this could use some love.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.06%. Comparing base (f3966d5) to head (6ddd441).
Report is 28 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
duckdb	?
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
keda	?
milvus	?
presto	?
quarkus	?
solr	?
supabase	?
teradata	94.27% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[iliakur]

not worth it, closing