chore(repo): ensure nx build does not run with other tasks (#30857)

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## Current Behavior
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`nx:build` has `build/packages/nx` as an output. At the same time,
`build-base` tasks which depend on Nx.. are compiling based on
`build/pacakges/nx`. When `nx:build` is being restored from cache..
`build/packages/nx` gets deleted.. and then restored. While it is
deleted, `tsc` tasks are unable to find modules from `nx`.

## Expected Behavior
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This isn't necessarily the correct solution, but `nx:build` will no
longer support parallelism ensuring that it does not get restored from
the cache while other `build-base` `tsc` tasks are running. The proper
fix is to fix the outputs of `nx:build` to be more specific about the
files that it is actually modifying.

## Related Issue(s)
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merged. -->

Fixes #

packages/nx/project.json

@@ -106,6 +106,7 @@
       "command": "echo hi"
     },
     "build": {
+      "parallelism": false,
       "dependsOn": ["^build-client", "build-base", "build-native"],
       "inputs": [
         "production",