[chore] Fix filelog receiver test with new component.ValidateConfig…

… behavior (#37448)

#### Description

`component.ValidateConfig` now validates interfaces. The
`(*helper.TimeParser).Validate` method is now called while validating
`FileLogConfig` and as a result, the struct is modified during
validation. The simplest fix seemed to be to apply these same changes to
the expected config struct by calling `Validate` on it, even though the
assertion logic in the test now feels a little circular.

I can try to refactor the struct a bit to make it more directly testable
if desired.

This is needed for
#37447.

---------

Co-authored-by: Evan Bradley <[email protected]>

receiver/filelogreceiver/filelog_test.go

@@ -257,6 +257,10 @@ func testdataConfigYaml() *FileLogConfig {
 						timeCfg := helper.NewTimeParser()
 						timeCfg.Layout = "%Y-%m-%d"
 						timeCfg.ParseFrom = &timeField
+						// The Validate method modifies private fields on the helper.TimeParser
+						// object that need to be set for later comparison.
+						// If validation fails, the test will fail, so discard the error.
+						_ = timeCfg.Validate()
 						cfg.TimeParser = &timeCfg
 						return cfg
 					}(),