fix(core): regression register ts transpiler for local plugin

[Roozenboom]

This change solves a regression after #22527 in NX 18.3.x with registering the ts transpiler for local plugins.

In the deleted file packages/nx/src/utils/nx-plugin.ts the method registerPluginTSTranspiler was called on line 461 1f04cde#diff-4cb86fce6ea77ce0e318878f99d35ca09197cd67f2b4024a996d41bba47d3ea2L460-L462

This part was missing in the replacement file packages/nx/src/project-graph/plugins/loader.ts around line 120
https://github.com/nrwl/nx/pull/22527/files#diff-42e02f59c2df8000df3ad944ae8a5d21b25c9593087666c8e6577cce2b17faecR120

Current Behavior

ts transpiler is not registered for local plugin generators that use a directory structure with index.ts

Expected Behavior

The ts transpiler is registered for local plugins

Related Issue(s)

Fixes #22958

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• nx affected --targets=e2e,e2e-ci --base=6cab4c9a1bfbf21d425be98640bf1a24df8ebbd8 --head=1b2131bae8ff0f734d746392463c6fb64432360b --parallel=1
• nx affected --targets=lint,test,build --base=6cab4c9a1bfbf21d425be98640bf1a24df8ebbd8 --head=1b2131bae8ff0f734d746392463c6fb64432360b --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=6cab4c9a1bfbf21d425be98640bf1a24df8ebbd8 --head=1b2131bae8ff0f734d746392463c6fb64432360b
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=6cab4c9a1bfbf21d425be98640bf1a24df8ebbd8 --head=1b2131bae8ff0f734d746392463c6fb64432360b

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[AgentEnder]

Good catch @Roozenboom... Can you move the implementation to inside readPluginPackageJson? We already register the transpiler correctly in other cases.

[Roozenboom]

Good catch @Roozenboom... Can you move the implementation to inside readPluginPackageJson? We already register the transpiler correctly in other cases.

Hi @AgentEnder, I updated the PR and moved the implementation to readPluginPackageJson. Please let me know if this is ok like this.

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