fix: cli error message and logging

[leoparente]

This pull request refactors error handling and logging in the cmd/diode-replay-dryrun/main.go file to improve clarity and consistency. It replaces log with fmt for better control over output streams and updates error messages for improved user feedback.

Error handling improvements:

• Replaced log.Fatal with fmt.Fprintf to print errors to os.Stderr and explicitly exit the program with os.Exit(1) for better control over error handling.
• Updated error messages to provide more detailed and user-friendly feedback, such as specifying required arguments and clarifying error contexts. [1] [2]

Logging improvements:

• Replaced log.Printf with fmt.Fprintf to direct output to the appropriate streams (os.Stderr for errors, os.Stdout for success messages).

Minor updates:

• Updated the -target flag description to fix a typo in the example URL.
• Removed the unused log import and replaced it with fmt.

[mfiedorowicz]

🥦

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	0.00s	github.com/netboxlabs/diode-sdk-go/cmd/diode-replay-dryrun	0.0%	0	0	0
🟢 PASS	1.30s	github.com/netboxlabs/diode-sdk-go/diode	20.4%	218	0	0

Total coverage: 76.1%