🪲 Add missing error to PriceFeedMock

[0xAkuti]

Adds missing error definition for the error LZ_PriceFeed_NotAnOPStack which is used in PriceFeedMock._getL1LookupId() and currently causing issues (#978).

Error: 
Compiler run failed:
Error (7576): Undeclared identifier.
   --> lib/devtools/packages/test-devtools-evm-foundry/contracts/mocks/PriceFeedMock.sol:184:16:
    |
184 |         revert LZ_PriceFeed_NotAnOPStack(l2Eid);
    |                ^^^^^^^^^^^^^^^^^^^^^^^^^

The alternative would be to add it in ILayerZeroPriceFeed where the error LZ_PriceFeed_UnknownL2Eid which was previously used is defined, but since LZ_PriceFeed_NotAnOPStack seems to only be used in this mock and not in layerzero v2 adding it here seems to be the way to go.

[0xAkuti]

Hi, any feedback on this? @janjakubnanista
Would be nice to merge it since we currently use a forked repo with the fix and would like to use the official one.

[janjakubnanista]

Hey @0xAkuti! Could you please include a changeset? You just need to run pnpm changeset from the root of the repo and mark this package as patch, thanks!

If you're at it I would also update the branch on top of the newest main from devtools, we included some bug fixes that remedied flaky test runs

[0xAkuti]

Hi @janjakubnanista, I added the changeset and updated to the current main