Do not watch ignored files

[rm3l]

/kind task

Follow-up to a discussion related to #5689

Context

I noticed that while the changes here worked great for sync'ing, we were still unnecessarily watching files that were supposed to be ignored. For example, I saw these logs while testing on a simple multi-module Maven project:

I0426 10:57:01.415897  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target
I0426 10:57:01.415905  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/classes
I0426 10:57:01.415913  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/classes/io
I0426 10:57:01.415920  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/classes/io/jitpack
I0426 10:57:01.415929  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/generated-sources
I0426 10:57:01.415938  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/generated-sources/annotations
I0426 10:57:01.415946  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/generated-test-sources
I0426 10:57:01.415955  907437 watch.go:176] adding watch on path /home/asoro/work/tmp/maven-modular/module2/target/generated-test-sources/test-annotations

As discussed together, the "watch" part will be fixed in a separate issue/PR.

Originally posted by @rm3l in #5689 (comment)

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