fix(core): always load nxignore last for highest priority

[Cammisuli]

Current Behavior

when loading ignore files, the underlying framework uses async mechanisms to read these files. Even if we pass the files in a set order, the async nature would be FutureUnordered. This causes the nxignore to sometimes be loaded before gitignore, where we always want it to be loaded last.

Expected Behavior

The nxignore file is added after all other ignore files have been read and loaded.

• Also added bonus of stabilizing the watcher unit tests

Related Issue(s)

Fixes #

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Nov 7, 2023 7:51pm

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=457bbcbe5778fc7f4e8183ac7a1a6148b4867995 --head=08115d3c15cf9705f6c5daed06bda5767ac4f383 --parallel=1
• nx affected --targets=lint,test,build --base=457bbcbe5778fc7f4e8183ac7a1a6148b4867995 --head=08115d3c15cf9705f6c5daed06bda5767ac4f383 --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=457bbcbe5778fc7f4e8183ac7a1a6148b4867995 --head=08115d3c15cf9705f6c5daed06bda5767ac4f383
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=457bbcbe5778fc7f4e8183ac7a1a6148b4867995 --head=08115d3c15cf9705f6c5daed06bda5767ac4f383

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[github-actions]

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