API schema that is not subject to rspec execution is deleted.

When running `OPENAPI=1 rspec spec/requests/samples_spec.rb:15` is run, the schema that is not under test is also deleted.

request spec
```ruby
describe 'Sample API TEST', :api_admin, type: :request do
let(:headers) { { headersample: "headersample" } }
let(:sample) { create(:sample, name: "srockstyle") }
let(:params) { { } }

before do
restaurant
end
it 'Test A' do
get "/v1/sample", headers: headers, params: params
expect(response).to(have_http_status(200))
end

it 'Test B' do
get "/v1/sample/#{sample.id}", headers: headers, params: params
expect(response).to(have_http_status(200))
end
end
```

openapi.yaml created after running `OPENAPI=1 rspec spec/requests/samples_spec.rb`
```yaml
---
openapi: 3.0.3
info:
title: app
version: 1.0.0
servers: []
paths:
"/v1/samples":
post:
summary: index
tags:
- Sample
parameters:
- name: id
in: path
required: true
schema:
type: integer
example: 1
responses:
'200':
description: Index sample
content:
application/json:
schema:
type: array
items:
type: object
properties:
id:
type: integer
name:
type: string
example:
- id: 1
name: srockstyle
job: sample
"/v1/samples/{id}":
post:
summary: index
tags:
- Sample
responses:
'200':
description: Index sample
content:
application/json:
schema:
type: object
properties:
id:
type: integer
name:
type: string
example:
id: 1
name: srockstyle
job: sample
```

Then spec was specified on a line and the command was executed `OPENAPI=1 rspec spec/requests/samples_spec.rb:10`,
yaml left only the specified parts and deleted the parts that were not specified.
```yaml
---
openapi: 3.0.3
info:
title: app
version: 1.0.0
servers: []
paths:
"/v1/samples":
post:
summary: index
tags:
- Sample
parameters:
- name: id
in: path
required: true
schema:
type: integer
example: 1
responses:
'200':
description: Index sample
content:
application/json:
schema:
type: array
items:
type: object
properties:
id:
type: integer
name:
type: string
example:
- id: 1
name: srockstyle
job: sample
```

I expect the following behavior, are there any options?
- Do not delete schema that is not to be executed
- get request" is processed as "post request", so we want to treat it as "get".