chore(core): watcher2 => watcher

[timoffex]

Description

Renames the watcher2 package because the watcher package it replaced is finally deleted.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.82%. Comparing base (865a816) to head (4251b52).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7622      +/-   ##
==========================================
+ Coverage   75.80%   75.82%   +0.02%     
==========================================
  Files         502      502              
  Lines       54048    54048              
==========================================
+ Hits        40970    40982      +12     
+ Misses      12671    12659      -12     
  Partials      407      407              

Flag	Coverage Δ
func	41.15% <ø> (+<0.01%)	⬆️
system	63.47% <100.00%> (+0.02%)	⬆️
unit	56.40% <50.00%> (+0.04%)	⬆️

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Files	Coverage Δ
core/internal/runfiles/runfiles.go	100.00% <ø> (ø)
core/internal/runfiles/uploader.go	78.94% <ø> (ø)
core/internal/watcher/impl.go	78.65% <ø> (ø)
core/internal/watcher/watcher.go	100.00% <ø> (ø)
core/internal/watchertest/watchertest.go	50.00% <ø> (ø)
core/pkg/server/sender.go	71.41% <ø> (ø)
core/pkg/server/stream.go	97.02% <100.00%> (ø)
core/pkg/server/stream_init.go	94.80% <ø> (ø)
core/pkg/server/tb.go	22.41% <ø> (ø)
core/internal/runfilestest/runfilestest.go	0.00% <0.00%> (ø)

... and 9 files with indirect coverage changes