Move release notes scripts to scripts/release/

[yurishkuro]

Which problem is this PR solving?

• Part of Reorganize scripts/ folder #6429

Description of the changes

• Move release notes scripts to scripts/release/
• Update Makefile to point to new locations

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (bd7e3da) to head (2491633).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6483      +/-   ##
==========================================
- Coverage   96.28%   96.27%   -0.02%     
==========================================
  Files         370      370              
  Lines       21170    21170              
==========================================
- Hits        20384    20381       -3     
- Misses        602      604       +2     
- Partials      184      185       +1     

Flag	Coverage Δ
badger_v1	10.75% <ø> (ø)
badger_v2	2.80% <ø> (ø)
cassandra-4.x-v1-manual	16.64% <ø> (ø)
cassandra-4.x-v2-auto	2.73% <ø> (ø)
cassandra-4.x-v2-manual	2.73% <ø> (ø)
cassandra-5.x-v1-manual	16.64% <ø> (ø)
cassandra-5.x-v2-auto	2.73% <ø> (ø)
cassandra-5.x-v2-manual	2.73% <ø> (ø)
elasticsearch-6.x-v1	20.33% <ø> (-0.01%)	⬇️
elasticsearch-7.x-v1	20.40% <ø> (-0.01%)	⬇️
elasticsearch-8.x-v1	20.56% <ø> (ø)
elasticsearch-8.x-v2	2.79% <ø> (ø)
grpc_v1	12.41% <ø> (ø)
grpc_v2	9.16% <ø> (ø)
kafka-3.x-v1	10.59% <ø> (ø)
kafka-3.x-v2	2.80% <ø> (ø)
memory_v2	2.80% <ø> (+<0.01%)	⬆️
opensearch-1.x-v1	20.46% <ø> (+<0.01%)	⬆️
opensearch-2.x-v1	20.45% <ø> (ø)
opensearch-2.x-v2	2.79% <ø> (ø)
tailsampling-processor	0.52% <ø> (ø)
unittests	95.14% <ø> (-0.02%)	⬇️

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