ILM introduce the check-ts-end-time-passed step (#100179) (#100198)

This introduces a new ILM step, the `check-ts-end-time-passed` step
that'll wait for the `index.time_series.end_time` to lapse for TS
indices before allowing ILM to proceed with the execution of the
following actions: * downsample * forcemerge * readonly *
searchable_snapshot * shrink

TSDS indices are allowed to receive writes until the configured
`index.time_series.end_time` time passes. This makes sure ILM doesn't
block these indices from accepting writes prematurely.

NOTE: documentation is added in a subsequent PR

Fixes #99696

(cherry picked from commit 8bf8fc1)

Signed-off-by: Andrei Dan <[email protected]>

Author: andreidan