[refactor] Rename storage/v1/es to storage/v1/elasticsearch

[yurishkuro]

Which problem is this PR solving?

• Part of Move All Storage Packages Under internal #6637
• es was the only package name that did not contain the full name of the database.

Description of the changes

• Bring the naming in line with the rest of the backends: es -> elasticsearch
• Keep direct imports using es as alias to minimize code changes
• Change es-mapping-generator binary location to match other binaries: ./cmd/esmapping-generator/{binary}-{platform}
• Remove unused target build-esmapping-generator-linux

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.93%. Comparing base (f3b3981) to head (a623802).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6655   +/-   ##
=======================================
  Coverage   95.93%   95.93%           
=======================================
  Files         365      365           
  Lines       20602    20602           
=======================================
  Hits        19765    19765           
  Misses        638      638           
  Partials      199      199           

Flag	Coverage Δ
badger_v1	9.92% <ø> (ø)
badger_v2	1.84% <ø> (ø)
cassandra-4.x-v1-manual	14.93% <ø> (ø)
cassandra-4.x-v2-auto	1.83% <ø> (ø)
cassandra-4.x-v2-manual	1.83% <ø> (ø)
cassandra-5.x-v1-manual	14.93% <ø> (ø)
cassandra-5.x-v2-auto	1.83% <ø> (ø)
cassandra-5.x-v2-manual	1.83% <ø> (ø)
elasticsearch-6.x-v1	19.30% <ø> (ø)
elasticsearch-7.x-v1	19.38% <ø> (ø)
elasticsearch-8.x-v1	19.55% <ø> (ø)
elasticsearch-8.x-v2	1.84% <ø> (ø)
grpc_v1	10.90% <ø> (ø)
grpc_v2	7.89% <ø> (ø)
kafka-3.x-v1	10.21% <ø> (ø)
kafka-3.x-v2	1.84% <ø> (ø)
memory_v2	1.84% <ø> (ø)
opensearch-1.x-v1	19.43% <ø> (ø)
opensearch-2.x-v1	19.43% <ø> (ø)
opensearch-2.x-v2	1.84% <ø> (ø)
tailsampling-processor	0.48% <ø> (ø)
unittests	94.82% <ø> (ø)

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