chore: Change general-date helper timezone argument

[divyamtayal]

Fixes #5795

Changes proposed in this pull request:

• change the timezone to keyword argument, like {{general-date date tz=timezone}}

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[codecov]

Codecov Report

Merging #5799 (84c4aa9) into development (d427ea6) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #5799   +/-   ##
============================================
  Coverage        23.48%   23.48%           
============================================
  Files              511      511           
  Lines             5454     5454           
  Branches            63       63           
============================================
  Hits              1281     1281           
  Misses            4157     4157           
  Partials            16       16           

Impacted Files	Coverage Δ
app/helpers/general-date.js	66.66% <100.00%> (ø)

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[divyamtayal]

@iamareebjamal Its Done