ORM-datamanagers improvements

[jotare]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

Describe how you tested this PR.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.12346% with 8 lines in your changes missing coverage. Please review.

Project coverage is 86.28%. Comparing base (14a5338) to head (205bf6d). Report is 325 commits behind head on main.

Files with missing lines	Patch %	Lines
nucliadb/src/nucliadb/ingest/orm/knowledgebox.py	83.33%	4 Missing :warning:
nucliadb/src/nucliadb/writer/back_pressure.py	0.00%	2 Missing :warning:
...cliadb/src/nucliadb/common/datamanagers/cluster.py	94.11%	1 Missing :warning:
...iadb/src/nucliadb/common/datamanagers/resources.py	50.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2292      +/-   ##
==========================================
+ Coverage   86.22%   86.28%   +0.05%     
==========================================
  Files         358      358              
  Lines       21972    21967       -5     
==========================================
+ Hits        18946    18954       +8     
+ Misses       3026     3013      -13     

Flag	Coverage Δ
nucliadb	72.39% <87.65%> (+0.12%)	:arrow_up:
nucliadb-reader	24.92% <54.32%> (+<0.01%)	:arrow_up:
nucliadb-search	32.12% <50.61%> (+0.02%)	:arrow_up:
nucliadb-standalone	48.00% <51.85%> (+0.04%)	:arrow_up:
nucliadb-train	46.67% <55.55%> (+0.02%)	:arrow_up:
nucliadb-writer	38.28% <59.25%> (+0.02%)	:arrow_up:
nucliadb_dataset	60.09% <ø> (ø)
nucliadb_models	85.37% <ø> (ø)
nucliadb_sdk	77.48% <ø> (ø)
nucliadb_sidecar	94.23% <ø> (ø)
nucliadb_telemetry	86.57% <ø> (ø)
nucliadb_utils	83.47% <ø> (ø)

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[jotare]

I think there were nice improvements but rollover and some other unit tests were awfully hard to get right... As it's been more than half year open without changes, I'll close it