Specify very large block size to force put blob instead of stage block/put block list

[gapra-msft]

No description provided.

[adreed-msft]

Work is mostly fine, I have some comments regarding defaults, overriding, etc.

[gapra-msft]

Didn't see this prior to my last comment. Does it really make sense to override the user's input here instead of indicating it is nonsensical? If we do override the user's input, we should probably log that we did, and make it generally apparent that we are doing something intentionally different, otherwise it may be looked at as a bug.

I was mostly copying the pattern of how we deal with BlockBlobBLockSize. We should probably log that we updated it, you're right. I will fix that for both BlockBlobBlockSize and this new variable

[gapra-msft]

Secondarily, DefaultPutBlobSize is unused.

You're right. I think I was planning to use DefaultPutBlobSize then decided it's probably better to use the block size so that customers don't experience any "breaking changes" from this PR. I will get rid of the DefaultPutBLobSize var and update the comment.