Fixes PUN tariff not loading if next day data is not yet available.

[MobilettoSoft]

Fixes #29066. The GME website usually doesn't publish data for the next day until 13.00 CET; this slows down the startup because the code keeps retrying before giving up and prevents the tariff to load.
With this fix, when retrieving data for the next day, if the server responds with a 404 error, the code stops trying and loads the tariff only with the data of the current day.

[sourcery-ai]

Hey - I've left some high level feedback:

• Consider centralizing the special handling of ErrPunDataNotAvailable (e.g., inside backoffPermanentError or a dedicated helper) so the logic for which errors are treated as permanent is not split between the retry closure and the outer error check.
• It may be helpful to expand the comment near the ErrPunDataNotAvailable handling to clarify that this specific error is intentionally treated as non-fatal for the overall run (no log, no done signal) to avoid retries when next-day data isn’t yet published.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider centralizing the special handling of `ErrPunDataNotAvailable` (e.g., inside `backoffPermanentError` or a dedicated helper) so the logic for which errors are treated as permanent is not split between the retry closure and the outer error check.
- It may be helpful to expand the comment near the `ErrPunDataNotAvailable` handling to clarify that this specific error is intentionally treated as non-fatal for the overall run (no log, no `done` signal) to avoid retries when next-day data isn’t yet published.

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