Close the Stream when a Subscription Operation is Completed

[ThisaruGuruge]

Purpose

$Subject

Fixes: #3661

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility

[codecov]

Codecov Report

Base: 87.14% // Head: 87.12% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (35a4a6f) compared to base (461dcc6).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1067      +/-   ##
==========================================
- Coverage   87.14%   87.12%   -0.03%     
==========================================
  Files          59       59              
  Lines        4498     4504       +6     
  Branches     2458     2463       +5     
==========================================
+ Hits         3920     3924       +4     
- Misses        548      550       +2     
  Partials       30       30              

Impacted Files	Coverage Δ
ballerina/websocket_service.bal	85.36% <ø> (ø)
ballerina/websocket_utils.bal	95.65% <66.66%> (-2.77%)	⬇️

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