[BUG] Platform config fields other than 'endpoint' and 'insecure' cannot be overriden in flyte-cli commands

[eapolinario]

Describe the bug

Plaform config fields like auth mode or client id cannot be overriden via env vars nor config files in flyte-cli commands. The reason behind this is this line, which ends up creating a PlatformConfig object containig default values for all fields but 'endpoint' and 'insecure'.

Expected behavior

The usual methods of replacing config entries (i.e. either relying on env vars or a config file) should apply, regardless of the type of the config being loaded.

Additional context to reproduce

No response

Screenshots

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Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes