Add target-specific option to ignore / include files for NX affected

[KingScouter]

As mentioned in other issues (for example #15414), currently there seems to be no option to configure NX affected per target to include / exclude certain files for the calculations. This is compared to the "inputs" available per target, which affect how the cache determines changes.
As far as I can tell, for NX Affected the only options to ignore files are using .gitignore or .nxignore, but both of them are "global", meaning you can only exclude files for all targets at once, which limits the possibilities here.

Suggestions:

1. The best solution of course would be to just use the same "inputs" already configured for the targets and which do exactly what we need, but currently only for the cache.
2. A second idea would be to introduce target-specific .nxignore files. So for example you can have a global .nxignore which will be considered for all NX operations, and additionally also a target-specific .nxignore.TARGET_NAME (e.g. .nxignore.lint , .nxignore.test), which will only be considered for those targets. If a global and a target-specific file exists, they should both be considered, similar to how .gitignore handles other .gitignore files in sub-directories.