CircuitPython 10.0: remove OTA partition from 4MB Espressif builds to make room for BLE

[dhalbert]

Remove OTA partition from Espressif 4MB builds to make room for BLE, and then expand the firmware partition.

This requires new bootloaders, I assume. We need to come up with a transition plan.

[bill88t]

Right now, boards theoretically upgraded from before the dualbank storage expansion (#7000) could still have been upgraded to CP9.x without losing fs contents, and have working installations on ota1.

[tannewt]

This depends on: adafruit/tinyuf2#432

[tannewt]

Today we talked about this in the internal meeting. We want to start with one board (S3 feather w/4MB probably) to ensure we have the instructions correct for doing all of them.

[dhalbert]

I successfully did this on the 4MB Feather S3, and understand what the user sees when the wrong bootloader is present, etc.