fix(nx-plugin): plugins should not include spec files

[AgentEnder]

Current Behavior

*.spec.ts files are included when publishing a plugin

Expected Behavior

*.spec.ts files should not be included in built dist folder.

Related Issue(s)

Fixes #5563

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Nx Cloud Report

CI ran the following commands for commit 1344396. Click to see the status, the terminal output, and the build insights.

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Status	Command
	nx affected --target=build
	nx affected --target=e2e
	nx affected --target=lint
	nx affected --target=test
	nx run-many --target=build --projects=create-nx-plugin
	nx run-many --target=build --projects=nx-plugin
	nx run-many --target=build-base --projects=create-nx-plugin
	nx run-many --target=build-base --projects=devkit
	nx run-many --target=build-base --projects=nx-plugin
	nx run-many --target=build-base --projects=tao
	nx run-many --target=build-base --projects=workspace
	nx run-many --target=e2e --projects=e2e-nx-plugin
	nx run-many --target=lint --projects=create-nx-plugin
	nx run-many --target=lint --projects=nx-plugin
	nx run-many --target=test --projects=create-nx-plugin
	nx run-many --target=test --projects=nx-plugin

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[AgentEnder]

Note: This change adds an additional glob pass through plugin source code in workspace.json > projects > my-plugin > build > assets.

This could be condensed to maintain 1 glob pass, but the result is much less readable. For future reference, the condensed glob section would look like:

{
  input: './packages/core',
  glob: '**/@(!(*.ts)|@(*.d.ts))',
  output: './src'
}

[github-actions]

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