Handle Intermittent Google Service failures

[gilesknap]

The Google service has bugs which means some items can never download, attempts to access the media IDs gets a 500 error. We place offending items in the gphotos.bad_ids.yaml.

However, it is important to distinguish between this and intermittent service failure (as far as is possible anyway). See #98 (comment) for more discussion.

[gilesknap]

Since https://issuetracker.google.com/issues/116842164 has now been fixed we could probably retire the bad_ids logic and exit with an error if retries fail to download a file.

[gilesknap]

TODO: disable bad_id logic (but keep the code so it can be switched on again easily )

[gilesknap]

See #125 - maybe people are still getting 500s so it is still useful to have the BadIds logic.

This means we need to distinguish between

• Null response in mediaItems.batchGet
• 500 errors

However, I think there are sometimes intermittent 500s in which case there is no solution.

[gilesknap]

If the cause of bad ids has now been fixed (see https://issuetracker.google.com/issues/141255600#comment8)
it is time to remove the BadIds handling, then always report errors.

[gilesknap]

https://issuetracker.google.com/issues/141255600 is fixed - I will remove bad ids feature

[gilesknap]

Bad ids feature removed. Thus in future, intermittent failures will be reported but have no effect on future runs.