fix(esp-bootloader-esp-idf): allow FlashRegion::erase up to partition end

[adstep]

Submission Checklist 📝

• I have updated existing examples or added new ones (if applicable).
• I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• I have added changelog entries and/or migration guide notes in the sections below, or I will ask a maintainer to add the skip-changelog or manual-changelog label as appropriate.
• My changes are in accordance to the esp-rs developer guidelines

Extra:

• I have read the CONTRIBUTING.md guide and followed its instructions.

Pull Request Details 📖

Description

FlashRegion::erase(from, to) rejects to == partition_end with Error::OutOfBounds, even though that is the natural and correct value for "erase the whole slot." embedded_storage::nor_flash::NorFlash::erase documents its to parameter as the exclusive end of the range, so erasing an N-byte partition aligned to its start needs to pass to = N — which today fails.

Root cause. The two address_to bounds checks both use Range::contains, which has half-open [start, end) semantics and rejects exactly address_to == range.end. The sibling write/read impls in the same file use the in_range helper, which does the upper bound the right way (address + len <= range.end); erase is the odd one out.

Fix. Replace the half-open check with an inclusive upper-bound comparison, and add a defensive to < from guard the original code happened not to have.