Chore: bump version to 2.7.0

[joshuarrrr]

Description

Bump version from 2.6.0 to 2.7.0

Issues Resolved

part of #3447

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov-commenter]

Codecov Report

Merging #3625 (341db2a) into 2.x (f980684) will increase coverage by 0.00%.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##              2.x    #3625   +/-   ##
=======================================
  Coverage   66.46%   66.47%           
=======================================
  Files        3206     3206           
  Lines       61597    61597           
  Branches     9503     9503           
=======================================
+ Hits        40941    40947    +6     
+ Misses      18383    18379    -4     
+ Partials     2273     2271    -2     

Flag	Coverage Δ
Linux	66.42% <ø> (+<0.01%)	⬆️
Windows	66.41% <ø> (ø)

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see 3 files with indirect coverage changes

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[kavilla]

Historically done by the opensearch-build team right after release. I wonder how come the change?