Rename functions "util.Remove" (remove.go) to "util.RemoveWithRetry"
(file_retry.go) and add comments to clarify their behaviors, also add
tests.
Refactor callers: when no concurrent access (cmd cli, migration, app
init, test), use "os.Xxx" directly.
More details are in `modules/util/file_retry.go`
By the way, clean up OS (windows) detection, make FileURLToPath test
always run
Migrations should never use model structs directly, because the model
structs can be different in different releases. e.g. if one migration uses
"User" model, it works in the early releases, then one day, when the
User model changes, the migration breaks because it will use the
new (incorrect) User model, it should only use the old User model.
The same to "modules/structs".
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Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
