Follow-up fixes to main PrepareProposal implementation (#9162)

* -----start------

* [cherrypicked] state: panic on ResponsePrepareProposal validation error (#8145)

* state: panic on ResponsePrepareProposal validation error

* lint++

Co-authored-by: Sam Kleinman <garen@tychoish.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* [cherrypicked] abci++: remove CheckTx call from PrepareProposal flow (#8176)

* [cherrypicked] abci++: correct max-size check to only operate on added and unmodified (#8242)

* [cherrypicked] Remove `ModifiedTxStatus` from the spec and the code (#8210)

* Outstanding abci-gen changes to 'pb.go' files

* Removed modified_tx_status from spec and protobufs

* Fix sed for OSX

* Regenerated abci protobufs with 'abci-proto-gen'

* Code changes. UTs e2e tests passing

* Recovered UT: TestPrepareProposalModifiedTxStatusFalse

* Adapted UT

* Fixed UT

* Revert "Fix sed for OSX"

This reverts commit e576708c61.

* Update internal/state/execution_test.go

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Update abci/example/kvstore/kvstore.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update internal/state/execution_test.go

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Update spec/abci++/abci++_tmint_expected_behavior_002_draft.md

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Addressed some comments

* Added one test that tests error at the ABCI client + Fixed some mock calls

* Addressed remaining comments

* Update abci/example/kvstore/kvstore.go

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Update abci/example/kvstore/kvstore.go

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Update abci/example/kvstore/kvstore.go

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Update spec/abci++/abci++_tmint_expected_behavior_002_draft.md

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

* Addressed William's latest comments

* Adressed Michael's comment

* Fixed UT

* Some md fixes

* More md fixes

* gofmt

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>
Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* make proto-gen

* Fixed testcase on PrepareProposal error

* mockery

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>
Co-authored-by: Sam Kleinman <garen@tychoish.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

proto/tendermint/abci/types.proto

@@ -298,8 +298,7 @@ message ResponseApplySnapshotChunk {
 }
 
 message ResponsePrepareProposal {
-  bool                             modified_tx             = 1;
-  repeated TxRecord                tx_records              = 2;
+  repeated TxRecord                tx_records              = 1;
 }
 
 //----------------------------------------