[7.x] Fix the API docs bug, where optional functions on interfaces were losing their children. (#107236)

[stacey-gammon]

Backports the following commits to 7.x:

• Fix the API docs bug, where optional functions on interfaces were losing their children. (Fix the API docs bug, where optional functions on interfaces were losing their children. #107236)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: ff74e6c
• Storybooks Preview

Metrics [docs]

Unknown metric groups

API count

id	before	after	diff
actions	117	119	+2
alerting	242	243	+1
apm	39	42	+3
bfetch	73	77	+4
cases	451	459	+8
charts	194	199	+5
core	2367	2454	+87
data	3690	3735	+45
dataVisualizer	104	108	+4
embeddable	456	460	+4
encryptedSavedObjects	28	29	+1
esUiShared	90	92	+2
expressions	2004	2030	+26
features	215	216	+1
fieldFormats	265	268	+3
fleet	1144	1149	+5
home	94	101	+7
indexPatternFieldEditor	41	44	+3
inspector	101	102	+1
kibanaLegacy	66	70	+4
kibanaReact	262	270	+8
kibanaUtils	551	600	+49
lens	207	208	+1
licensing	117	118	+1
maps	204	213	+9
ml	278	279	+1
observability	219	223	+4
presentationUtil	176	178	+2
ruleRegistry	89	95	+6
savedObjects	213	220	+7
savedObjectsTaggingOss	89	90	+1
securitySolution	1301	1325	+24
share	123	126	+3
spaces	106	110	+4
spacesOss	72	77	+5
taskManager	52	53	+1
telemetryCollectionManager	29	34	+5
timelines	899	928	+29
usageCollection	57	58	+1
visualizations	270	276	+6
total			+383

API count missing comments

id	before	after	diff
actions	117	119	+2
alerting	234	235	+1
apm	39	42	+3
bfetch	62	66	+4
cases	409	417	+8
charts	163	168	+5
core	1081	1165	+84
data	3172	3217	+45
dataVisualizer	104	108	+4
embeddable	384	388	+4
encryptedSavedObjects	26	27	+1
esUiShared	88	90	+2
expressions	1569	1595	+26
features	97	98	+1
fieldFormats	235	238	+3
fleet	1048	1049	+1
home	70	77	+7
indexPatternFieldEditor	36	39	+3
inspector	78	79	+1
kibanaLegacy	62	66	+4
kibanaReact	232	240	+8
kibanaUtils	359	406	+47
lens	191	192	+1
licensing	42	43	+1
maps	203	212	+9
ml	274	275	+1
observability	219	223	+4
presentationUtil	149	151	+2
ruleRegistry	89	95	+6
savedObjects	199	206	+7
savedObjectsTaggingOss	50	51	+1
securitySolution	1250	1274	+24
share	83	86	+3
spaces	0	4	+4
spacesOss	5	10	+5
taskManager	25	26	+1
telemetryCollectionManager	29	34	+5
timelines	779	808	+29
usageCollection	16	17	+1
visualizations	252	258	+6
total			+374

API count with any type

id	before	after	diff
core	148	149	+1
data	54	59	+5
dataVisualizer	3	5	+2
embeddable	4	5	+1
esUiShared	4	5	+1
expressions	58	65	+7
home	0	3	+3
indexPatternFieldEditor	1	2	+1
kibanaReact	7	8	+1
total			+22

Non-exported public API item count

id	before	after	diff
triggersActionsUi	19	18	-1

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