Remove Locks and Replace Clone Methods in Parser

[ThisaruGuruge]

Purpose

$Subject

Part of: ballerina-platform/ballerina-library#7652

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• No commons package changes (if there are any, please update the GraphQL version in GraphQL tools and Ballerina dev tools)
• No compiler package changes (if there are any, please update the GraphQL version in Ballerina dev tools)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 94.22572% with 22 lines in your changes missing coverage. Please review.

Project coverage is 85.22%. Comparing base (4e3b3de) to head (8b46aa8).
Report is 16 commits behind head on 2201.9.x.

Files with missing lines	Patch %	Lines
ballerina/modules/parser/lexer.bal	88.33%	7 Missing ⚠️
ballerina/field_validator_visitor.bal	94.25%	5 Missing ⚠️
ballerina/modules/parser/argument_node.bal	87.50%	2 Missing ⚠️
ballerina/response_generator.bal	84.61%	2 Missing ⚠️
ballerina/websocket_service.bal	50.00%	2 Missing ⚠️
ballerina/common_utils.bal	94.73%	1 Missing ⚠️
ballerina/context.bal	93.33%	1 Missing ⚠️
ballerina/executor_visitor.bal	92.85%	1 Missing ⚠️
ballerina/observe_utils.bal	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             2201.9.x    #2175      +/-   ##
==============================================
- Coverage       85.80%   85.22%   -0.58%     
  Complexity        823      823              
==============================================
  Files             126      126              
  Lines            9713     9713              
  Branches         3839     3831       -8     
==============================================
- Hits             8334     8278      -56     
- Misses           1034     1088      +54     
- Partials          345      347       +2     

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