Allow user to use `dataloader_idx` in log name in `LightningModule.log`

[lokesh-vr-17773]

Description & Motivation

Allow the user to include dataloader information in the log name when add_datalaoder_idx is set to False.

Pitch

Since LightningModule.log includes the add_dataloader_idx flag for logging, it is beneficial to allow users to include dataloader information in the log name when add_dataloader_idx is set to False. This aligns with the intended purpose of the add_dataloader_idx flag.

Proposed change:

if add_dataloader_idx and "/dataloader_idx_" in name:
  raise MisconfigurationException()

Alternatives

No response

Additional context

No response

cc @Borda

[lantiga]

Makes sense, would you like to send in a quick PR? Also it would be great if you could summarize why this is important for you as a user by providing a real-world case.