[Ruby] Generated client may contains unexpected interpolation when using pattern and/or enum

Description

When using pattern and/or enum, the generated Ruby client code may contain an unexpected interpolation.

Swagger-codegen version

$ java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar version
2.4.2-SNAPSHOT

$ git log --oneline -n 1
c4c5c062c Merge pull request #9080 from swagger-api/update-parser-v1

Swagger declaration file content or url

See: https://gist.github.com/autopp/e707d5d2ec36f7cfe6a3950d76d54b6f#file-swagger-yml

The point to notice in this example is that #{...} is included in the pattern.

Command line used for generation

java -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -i 'https://gist.githubusercontent.com/autopp/925901844b9c973fd3c86d06ea95c03a/raw/df474dc0331ee167d337a2cc7aadc49afdd7ee03/swagger.yml' -l ruby -o /tmp/gem

Steps to reproduce

1. Run the above command to generate client code for Ruby.
2. The generated lib/swagger_client/api/default_api.rb contains unexpected interpolation:

def foo_get_with_http_info(opts = {})
  if @api_client.config.debugging
    @api_client.config.logger.debug 'Calling API: DefaultApi.foo_get ...'
  end
  if @api_client.config.client_side_validation && !opts[:'x'].nil? && opts[:'x'] !~ Regexp.new(/^injected code: #{injected.code}$/)
    fail ArgumentError, "invalid value for 'opts[:\"x\"]' when calling DefaultApi.foo_get, must conform to the pattern /^injected code: #{injected.code}$/."
  end

In this example, injected.code is executed when request to GET /foo (And error may occur).

Related issues/PRs

#9091 and #9092 are similar probrems.

Suggest a fix/enhancement

Curretly, RubyClientCodegen dose not override escapeText.
Should not this be overridden to accommodate Ruby's string literal characteristics?

Start at RubyClientCodegen and inspect how escapeText is handled during Ruby client generation. Reproduce the issue with the provided Swagger URL and generation command, then verify that a pattern containing #{...} remains literal in lib/swagger_client/api/default_api.rb and does not interpolate when the request runs.