[FEA] Make '--platform' argument mandatory in CLI to prevent incorrect behavior

[parthosa]

Description

The platform detection logic currently relies on the event log file’s protocol (e.g. s3://, gs://, hdfs://) to identify the platform. This approach can lead to incorrect platform detection in certain cases:

• S3 Protocol: Event logs with the s3:// protocol are always identified as EMR, which is incorrect since Databricks AWS logs can also use S3 storage.
• File Protocol or Local Filesystem: Event logs stored locally or with the file:// protocol are always identified as onprem. This might not be the actual platform on which the user had run the application.

Impact

Incorrect platform detection leads to invalid speedup estimations, as QualX uses platform-specific models for its calculations.

Proposed Change

Until the platform detection logic is improved, make the --platform argument mandatory. This ensures users explicitly specify the platform, avoiding incorrect behavior.