Fix lifecycle plugin diagnostics being ignored during executable generation

[ShammiL]

Purpose

$Subject

Fixes #41915

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (0823dc9) 0.00% compared to head (f5263f5) 76.70%.
Report is 36 commits behind head on master.

Files	Patch %	Lines
.../java/io/ballerina/projects/JBallerinaBackend.java	62.50%	3 Missing ⚠️
...va/io/ballerina/cli/task/CreateExecutableTask.java	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #42131       +/-   ##
=============================================
+ Coverage      0.00%   76.70%   +76.70%     
- Complexity        0    53048    +53048     
=============================================
  Files             9     2883     +2874     
  Lines            35   199972   +199937     
  Branches          0    26030    +26030     
=============================================
+ Hits              0   153390   +153390     
- Misses           35    38131    +38096     
- Partials          0     8451     +8451     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.