fix(angular wrapper): cannot mix multi and regular providers

[dgonzalezr]

It should fix the following issue:

We tell Angular that the provider is a multi-provider.

[sonarqubecloud]

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0 Bugs
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0 Security Hotspots
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No Coverage information
0.0% Duplication

[dgonzalezr]

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✅ Successfully ran 5 targets

• nx affected --target=e2e --base=9e8899437c29bb26269264e7347c10e4f5eafadc --head=841a0e9dd18897f835e4eedaf4b2905f21a2c1f2 --exclude=workspace --output-style=stream-without-prefixes -- --ci --code-coverage --runInBand
• nx run bee-q:storybook-build --output-style=stream-without-prefixes
• nx run bee-q:storybook-build-css --output-style=stream-without-prefixes
• nx run-many --target=build --exclude=workspace --output-style=stream-without-prefixes
• nx affected --target=test --base=9e8899437c29bb26269264e7347c10e4f5eafadc --head=841a0e9dd18897f835e4eedaf4b2905f21a2c1f2 --exclude=workspace --output-style=stream-without-prefixes -- --ci --code-coverage --runInBand

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