build: Cherry pick commits for patch release

[gibson042]

Refs: Agoric/agoric-sdk#9224

Branch creation log:

$ git checkout -b gibson-2024-04-prep-hotfix v0.46.16-alpha.agoric.2.1

$ git log --oneline --graph -10 upstream/Agoric
* 1206d21b7e (upstream/HEAD, upstream/Agoric) fix(baseapp): Ignore events from simulated transactions (#413)
* f4acfd1b3f build(deps): Bump iavl to v0.19.7 (merge #412)
*   26f841fac4 (origin/Agoric, Agoric) Merge pull request #409 from agoric-labs/9224-abci-client-flag
|\  
| * e2ccda89e8 docs: changelog
| * 2dfc49e368 feat: feature flag to select ABCI client type
|/  
*   76e1519145 Merge pull request #408 from agoric-labs/jimlarson-doc-cleanup
|\  
| * 7d05dcdfd0 docs: update branch and tag conventions and policies
|/  
* fd885178a6 feat: configurable fee collector for DeductFeeDecorator (#407)
*   a0154d6890 Merge pull request #404 from agoric-labs/jimlarson-lint
|\  
| * e96708b346 chore: silence some lint warnings
|/  

$ git cherry-pick 2dfc49e368 e2ccda89e8 f4acfd1b3f 1206d21b7e
[gibson-2024-04-prep-hotfix 61a6f2ea66] feat: feature flag to select ABCI client type
 Author: Jim Larson <[email protected]>
 Date: Thu Apr 11 16:25:14 2024 -0700
 2 files changed, 78 insertions(+), 3 deletions(-)
 create mode 100644 server/start_test.go
Auto-merging CHANGELOG-Agoric.md
[gibson-2024-04-prep-hotfix 8db9c69a12] docs: changelog
 Author: Jim Larson <[email protected]>
 Date: Thu Apr 11 16:31:45 2024 -0700
 1 file changed, 1 insertion(+)
Auto-merging CHANGELOG-Agoric.md
[gibson-2024-04-prep-hotfix 0b554fc472] build(deps): Bump iavl to v0.19.7 (merge #412)
 Date: Fri Apr 12 14:42:47 2024 -0400
 3 files changed, 5 insertions(+), 2 deletions(-)
Auto-merging CHANGELOG-Agoric.md
[gibson-2024-04-prep-hotfix 23324f6535] fix(baseapp): Ignore events from simulated transactions (#413)
 Date: Fri Apr 12 14:43:58 2024 -0400
 2 files changed, 5 insertions(+), 1 deletion(-)

$ vim CHANGELOG-Agoric.md 
$ git diff v0.46.16-alpha.agoric.2.1 -- CHANGELOG-Agoric.md
diff --git c/CHANGELOG-Agoric.md w/CHANGELOG-Agoric.md
index 0ff514930d..472a30acff 100644
--- c/CHANGELOG-Agoric.md
+++ w/CHANGELOG-Agoric.md
@@ -45,6 +45,17 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (auth, bank) Agoric/agoric-sdk#8989 Remove deprecated lien support
 
+## `v0.46.16-alpha.agoric.2.2` - 2024-04-12
+
+### Improvements
+
+* (server) [#409](https://github.com/agoric-labs/cosmos-sdk/pull/409) Flag to select ABCI client type.
+* (deps) [#412](https://github.com/agoric-labs/cosmos-sdk/pull/412) Bump iavl to v0.19.7
+
+### Bug Fixes
+
+* (baseapp) [#413](https://github.com/agoric-labs/cosmos-sdk/pull/413) Ignore events from simulated transactions
+
 ## `v0.46.16-alpha.agoric.2.1` - 2024-03-08
 
 ### Improvements

$ git add CHANGELOG-Agoric.md 

$ git commit -m 'docs: Update changelog'
[gibson-2024-04-prep-hotfix 3468c72e55] docs: Update changelog
 1 file changed, 9 insertions(+), 4 deletions(-)

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md CHANGELOG-Agoric.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
• confirmed all CI checks have passed

Reviewers Checklist

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your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[JimLarson]

Failing lint check expected - it fails in upstream at this version.