HIL: Erase flash on failure

[SergioGasquez]

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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.
• My changes were added to the CHANGELOG.md in the proper section.
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Pull Request Details 📖

Description

• If running the tests fails, we erase the target flash to avoid subsequent test failures due to a peripheral being in a weird state.
  • This would avoid situations like the one that happened yesterday, where we tried to merge dma: add Mem2Mem to support memory to memory transfer #1738, the tests failed on S3 and all subsequent DMA tests were failing until I ssh into the machine and erase the target flash.
• Added docs for installing espflash

Testing

Not tested (not sure how I can test it)

[bjoernQ]

Thanks!

[JurajSadel]

LGTM, thanks!