Duplicate MPI_SELF as well

[ClaudiaComito]

Description

Expanding on #940, not only MPI.COMM_WORLD but also MPI_SELF must be duplicated

Issue/s resolved: #895

Changes proposed:

• duplicate MPI_SELF

Type of change

• New feature (non-breaking change which adds functionality)

Memory requirements

Performance

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

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[codecov]

Codecov Report

Merging #967 (3345abb) into main (4490237) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #967   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files          64       64           
  Lines        9898     9898           
=======================================
  Hits         9439     9439           
  Misses        459      459           

Flag	Coverage Δ
gpu	94.59% <100.00%> (ø)
unit	90.98% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
heat/core/communication.py	96.77% <100.00%> (ø)

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