Error when debug file too big to upload

[szokeasaurusrex]

There is a file size limit for debug files that are uploaded to Sentry (c.a. 2 GB). When a file exceeds this limit, we log a warning to inform users that the file was skipped:

sentry-cli/src/utils/dif_upload.rs

Lines 2049 to 2054 in 1d5d593

	warn!(
	"Skipping debug file since it exceeds {}: {} ({})",
	HumanBytes(self.max_file_size),
	name,
	HumanBytes(file_size.unwrap_or(u64::MAX)),
	);

This warning is easy to miss. So, instead of just warning users, we should error and exit with a nonzero status. Our error message can link users to the Symbol Server docs, and also inform them about the ability to set SENTRY_ALLOW_FAILURE to unblock build.