Error thrown in consuming workflows regarding JSON output values quotes

**Describe the bug**

Quotes in a reusable workflow's JSON output value is triggering an error in consuming workflows.

**To Reproduce**

Steps to reproduce the behavior:
1. Create a reusable workflow with input and outputs, one of the output being this JSON value:

```yaml
outputs:
images:
value: '{"gcp": "${{ contains(inputs.registries, ''gcp'') && jobs.setup.outputs.gcp_image || '''' }}", "ecr": "${{ contains(inputs.registries, ''ecr'') && jobs.setup.outputs.ecr_image || '''' }}"}'
```

2. Use the first workflow in another workflow:

```yaml
build:
uses: acme/actions/.github/workflows/build.yaml@v1
```

3. See the following errors in the 2nd workflow file, but __at the line number__ from the 1st workflow file:

```
Unexpected symbol: 'gcp'''. Located at position 31 within expression: contains(inputs.registries, ''gcp'') && jobs.setup.outputs.gcp_image || '''' [Ln 72, Col 26]
Unexpected symbol: 'ecr'''. Located at position 31 within expression: contains(inputs.registries, ''ecr'') && jobs.setup.outputs.ecr_image || '''' [Ln 72, Col 120]
```

**Expected behavior**

The 1st workflow does not throw any errors when being run in Github Actions runners, so I'd expect no errors to be printed by this extension.

**Extension Version**

`v0.27.1`

まず、issue に示されている reusable workflow と consuming workflow を使い、報告された拡張機能のバージョンを基準としてエラーを再現します。引用符で囲まれた JSON 式に対して生成される診断を追跡し、有効な GitHub Actions 構文が consuming workflow でエラーを報告しなくなっていること、またはエラーを誤った行に対応付けなくなっていることを確認します。

索引モデルが issue の本文から書いたものです。