compatibility-test-for-newer-releases failed on Compatibility tests

Host: ec2-3-239-120-20.compute-1.amazonaws.com
Project: WiredTiger (develop)
Commit: diff: WT-7514 Let tiered subsystem open files on behalf of block manager. (#6544)

Fixes in block manager, btree and elsewhere to get a basic test running.
Changed test_tiered04.py to add data to the btree.
The tiered cursor is using the file cursor code.
Grab all the file metadata and put it into the tiered metadata.
Changed interface to WT_BLOCK_FILE_OPENER slightly.
Removed bm->flush_tier() internal API, replaced by bm->switch_object().
Handle tiered files similarly to btrees.
Changed more uses of WT_DHANDLE_TYPE_BTREE to WT_DHANDLE_BTREE() macro.
Do fancy config footwork for grabbing the 'file:' config to
put into 'tiered:' (while removing readonly and tiered_object setting).
Added FIXME comments.
Add retries when flushing tier, EBUSY can happen with exclusive dhandle access.
Fix error path for releasing dhandle. | 02 Jun 21 22:52 UTC
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