fix: App crashes when a modal has a filepicker? (#10376)

[jsartisan]

(cherry picked from commit f646eea)

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Description

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and context. List any dependencies that are required for this change.

Fixes # (issue)

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Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

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• Test B

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Test coverage results 🧪

🟢 Total coverage has increased

// Code coverage diff between base branch:release and head branch: cp/fix-file-picker 

Status	File	% Stmts	% Branch	% Funcs	% Lines
🟢	total	55.06 (0.04)	36.56 (0.01)	34.49 (-0.03)	55.57 (0.06)
🟢	app/client/src/api/PluginApi.ts	89.47 (3.76)	100 (0)	60 (10)	88.89 (3.89)
🔴	app/client/src/components/formControls/DropDownControl.tsx	44.44 (-0.39)	2.17 (0.04)	16.67 (-3.33)	42.86 (0)
🔴	app/client/src/pages/Editor/GeneratePage/components/GeneratePageForm/GeneratePageForm.tsx	18.18 (-0.24)	10.47 (-0.06)	0 (0)	20.29 (-0.3)
🟢	app/client/src/pages/Editor/QueryEditor/EditorJSONtoForm.tsx	37.5 (1.56)	29.59 (0.69)	0 (0)	39 (1.68)
🟢	app/client/src/sagas/FormEvaluationSaga.ts	40 (15.68)	27.27 (12.27)	50 (25)	47.06 (18.03)
🟢	app/client/src/utils/autocomplete/TernServer.ts	52.94 (0.23)	41.67 (0.84)	36.21 (0)	56.99 (0.25)
🟢	app/client/src/widgets/CheckboxGroupWidget/component/index.tsx	25 (-4.03)	12.5 (6.94)	0 (0)	33.33 (-2.67)
🟢	app/client/src/widgets/CheckboxGroupWidget/widget/index.tsx	58.73 (7.38)	29.17 (2.25)	44.44 (6.34)	59.32 (7.15)
🔴	app/client/src/widgets/CheckboxWidget/component/index.tsx	96.55 (-0.42)	64 (-3.74)	90 (-0.91)	95.83 (-0.32)
🟢	app/client/src/widgets/TabsWidget/component/index.tsx	100 (10.89)	83.33 (18.33)	100 (18.18)	100 (9.3)
🔴	app/client/src/widgets/TabsWidget/widget/index.tsx	77.42 (-1.15)	47.14 (0)	78.95 (0)	77.27 (-0.51)
🟢	app/client/src/workers/formEval.ts	14.29 (0.4)	3.13 (0.31)	10 (0)	14.29 (0.4)
❌	app/client/src/widgets/CheckboxGroupWidget/constants.ts	100	100	100	100
❌	app/client/src/widgets/TabsWidget/constants.ts	100	100	100	100

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