[7.x] [Lens] add typeToAgg for median (#86078)

[mbondyra]

Backports the following commits to 7.x:

• [Lens] add typeToAgg for median ([Lens] add typeToAgg for median #86078)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: d82a7d1

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
lens	1.0MB	1.0MB	+19.0B
triggersActionsUi	1.5MB	1.5MB	-26.9KB
total			-26.9KB

Distributable file count

id	before	after	diff
default	47543	48306	+763

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
triggersActionsUi	161.5KB	161.6KB	+102.0B

Unknown metric groups

async chunk count

id	before	after	diff
triggersActionsUi	31	32	+1

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@elasticmachine merge upstream