Chat export parameter customisation (#7647)

* use export settings and hide fields

Signed-off-by: Kerry Archibald <kerrya@element.io>

* fix exporter tests

Signed-off-by: Kerry Archibald <kerrya@element.io>

* test ExportDialog with settings

Signed-off-by: Kerry Archibald <kerrya@element.io>

* tidy debugs, rename setting to Parameters

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use reasonable 100gb limit

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use normal setting instead of UIFeature

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use a customisation

Signed-off-by: Kerry Archibald <kerrya@element.io>

* move validateNumberInRange to utils

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use nullish coalesce

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use 8gb size limit for customisation

Signed-off-by: Kerry Archibald <kerrya@element.io>

* update comments

Signed-off-by: Kerry Archibald <kerrya@element.io>

test/utils/validate/numberInRange-test.ts

@@ -0,0 +1,26 @@
+import { validateNumberInRange } from '../../../src/utils/validate';
+
+describe('validateNumberInRange', () => {
+    const min = 1; const max = 10;
+    it('returns false when value is a not a number', () => {
+        expect(validateNumberInRange(min, max)('test' as unknown as number)).toEqual(false);
+    });
+    it('returns false when value is undefined', () => {
+        expect(validateNumberInRange(min, max)(undefined)).toEqual(false);
+    });
+    it('returns false when value is NaN', () => {
+        expect(validateNumberInRange(min, max)(NaN)).toEqual(false);
+    });
+    it('returns true when value is equal to min', () => {
+        expect(validateNumberInRange(min, max)(min)).toEqual(true);
+    });
+    it('returns true when value is equal to max', () => {
+        expect(validateNumberInRange(min, max)(max)).toEqual(true);
+    });
+    it('returns true when value is an int in range', () => {
+        expect(validateNumberInRange(min, max)(2)).toEqual(true);
+    });
+    it('returns true when value is a float in range', () => {
+        expect(validateNumberInRange(min, max)(2.2)).toEqual(true);
+    });
+});