Add watermark enum to zoekt indices

John Masonrequested to merge
jm-zoekt-index-watermark-enum into master

What does this MR do and why?

Add watermark enum to zoekt indices. This will allow us to keep the original state enum for index lifecycle and use watemark_level to enable/disable indexing tasks for an index.

We track a watermark_level enum instead of a simple integer field because it helps us track if/when we have handled (ie: dispatch an event and triggered a worker) the situation when a zoekt index has too much storage.

This is related to !166222 (merged) and #494261 (closed)

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Edited by John Mason

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