## Summary

The index list can be very slow to load on large clusters with a lot of
indices. In some cases it can even fail to load. Previously up to five
requests were made and combined to produce the index list. If even one
of those requests would fail then the whole list would fail.

Now the requests are made in parallel and failed requests will result in
partial data. The indexDataEnricher concept has been brought to the
client side which allows the display of data as its loaded, rather than
waiting for everything to load. Endpoints were added to support these
additional client side requests.

Previously byte values were being formatted server side but that no
longer makes sense when keeping kibana server processing minimal. A
significant percentage of code changes in this PR are dedicated to this.
Some of the formatting has been fixed as previously lowercase
abbreviations were used when they should be uppercase. In particular,
the `B` should be capitalized to indicate bytes and not bits.


### Release notes

Index Management index list loads much faster on large clusters with a
lot of indices.

---------

Signed-off-by: Matthew Kime <matt@mattki.me>
Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

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* commit '32efd9b2fb078ade51073fd2d0068bc74c029d6b': (49 commits)
  [Security Solution] Rules exceptions subfeatures (elastic#245722)
  [BK] Upgrade axios (elastic#251150)
  Fix AI Connector form fields resetting to default value when cleared by user (elastic#251095)
  deduplicate otel dependencies (elastic#250841)
  Adds initial agents.md file (elastic#250833)
  [index management] Faster index list loading (elastic#246276)
  skip failing test suite (elastic#251086)
  skip failing test suite (elastic#251048)
  [Security Solutions] Trial Companion - adjust UX design (elastic#250910)
  [Traces][Discover] Prevent flyout remount when switching document types in Trace Waterfall (elastic#250406)
  [DOCS][Cases][9.4 & Serverless]: Doc new `Maximum amount of cases to open` setting for case action (elastic#250993)
  [Discover][Traces] Explore trace.id from logs in Discover (elastic#249632)
  Remove ! from SOs docs link (elastic#251097)
  [ML] Maps: Add telemetry events for file uploads (elastic#247543)
  [Fleet] Fix dupplicate ids when copying an integration policy or an agent policy (elastic#250971)
  [Dashboards as Code] Add snake case object keys util (elastic#250962)
  [Core] Remove URL Overflow & Deprecate `storeInSessionStorage` setting (elastic#242972)
  [One Workflow] fix: Fix Variable Retrieval in Workflow Execution Engine (elastic#250852)
  Rework Elastic Managed LLMs page (elastic#251069)
  [Lens powered by ES|QL] Update Switch to Query mode modal warning message (elastic#251051)
  ...