[9.3] mise: add mise (#253596) (#270023)

# Backport

This will backport the following commits from `main` to `9.3`:
- [mise: add mise
(#253596)](#253596)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Tyler
Smalley","email":"tyler.smalley@elastic.co"},"sourceCommit":{"committedDate":"2026-05-19T19:08:04Z","message":"mise:
add mise (#253596)\n\nSigned-off-by: Tyler Smalley
<tyler.smalley@elastic.co>","sha":"784c438b62043b1eb46665df6c50a02ca8b764be","branchLabelMapping":{"^v9.5.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","backport:all-open","v9.5.0"],"title":"mise:
add
mise","number":253596,"url":"https://github.com/elastic/kibana/pull/253596","mergeCommit":{"message":"mise:
add mise (#253596)\n\nSigned-off-by: Tyler Smalley
<tyler.smalley@elastic.co>","sha":"784c438b62043b1eb46665df6c50a02ca8b764be"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.5.0","branchLabelMappingKey":"^v9.5.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/253596","number":253596,"mergeCommit":{"message":"mise:
add mise (#253596)\n\nSigned-off-by: Tyler Smalley
<tyler.smalley@elastic.co>","sha":"784c438b62043b1eb46665df6c50a02ca8b764be"}}]}]
BACKPORT-->

Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>
Co-authored-by: Tyler Smalley <tyler.smalley@elastic.co>

Author: kibanamachine

.github/CODEOWNERS

@@ -3064,6 +3064,9 @@ x-pack/solutions/security/test/moon.yml @elastic/kibana-operations
 /.agents/skills/scout-migrate-from-ftr/** @elastic/appex-qa
 /.agents/skills/scout-ui-testing/** @elastic/appex-qa
 
+
+/.mise.toml @elastic/kibana-operations
+
 ####
 ## These rules are always last so they take ultimate priority over everything else
 ####

.mise.toml

@@ -0,0 +1,5 @@
+[settings]
+idiomatic_version_file_enable_tools = ["node"]
+
+[tools]
+yarn = "1.22.21"