Cleanup ingest gRPC and id/slugs

[jotare]

Description

• Remove GetResourceId ingest call and use datamanagers directly from writer
• Remove ResourceFieldExists from ingest gRPC
• Simplify how we call writer endpoints by slug or by resource id. Functions get a rid and endpoints by slug convert it first, to avoid conditional code with optional rid/slug
• KB deletion only by kbid. Deletion by slug is not an option in the REST API and having both in ingest makes no sense

How was this PR tested?

Existing tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.06%. Comparing base (ea225f3) to head (cd78607). Report is 14 commits behind head on main.

:exclamation: Current head cd78607 differs from pull request most recent head a60bb9a. Consider uploading reports for the commit a60bb9a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2080      +/-   ##
==========================================
- Coverage   82.09%   82.06%   -0.04%     
==========================================
  Files          42       42              
  Lines        2346     2342       -4     
==========================================
- Hits         1926     1922       -4     
  Misses        420      420              

Flag	Coverage Δ
utils	81.70% <ø> (-0.03%)	:arrow_down:

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[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Exception: gRPC error: RpcFailure: 14-UNAVAILABLE upstream connect error or disconnect/reset before headers.... nucliadb.search.api.v1.search.catalog_post View Issue
• ‼️ Exception: gRPC error: RpcFailure: 14-UNAVAILABLE upstream connect error or disconnect/reset before headers.... nucliadb_telemetry.tikv in _traced_async_wrapper View Issue
• ‼️ Exception: gRPC error: RpcFailure: 14-UNAVAILABLE upstream connect error or disconnect/reset before headers.... nucliadb.search.api.v1.search.catalog_post View Issue

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