chore: minor update to manifest sanity check error message

[dentiny]

What changes are included in this PR?

This is the error message I get on my end:

Error: DataInvalid => Content type of entry PositionDeletes should have DataContentType::Data

At first sight, I have no idea what this means, until I read the sanity check code.

In this PR, I updated the error message for manifest write sanity check to provide more context:

• What's the manifest content file
• What's the filepath, this is useful for devs to directly understand what's the data file having issues
• What's the expected and actual data content type

Are these changes tested?

No-op change

[jonathanc-n]

Thank you @dentiny, this looks good to me!

[sdd]

LGTM, thanks for this @dentiny

[dentiny]

LGTM, thanks for this @dentiny

Thank you for the code review @sdd ! Could you please help merge when you have some time? Thank you!