Mock and error-response URL matching is case-sensitive while urlsToWatch is case-insensitive #1931

Description

URL matching is case-insensitive in urlsToWatch, but case-sensitive in the mock and error-response files. A URL that Dev Proxy intercepts may therefore quietly fail to match a mock or error entry when only its casing differs.

Evidence

Case-insensitive:

• urlsToWatch: DevProxy/Plugins/PluginServiceExtensions.cs (ConvertToRegex uses RegexOptions.IgnoreCase)
• RewritePlugin: DevProxy.Plugins/Manipulation/RewritePlugin.cs (regex with IgnoreCase)
• OpenAPI / API Center URL matching (prefix comparisons ignore case)

Case-sensitive (no IgnoreCase):

• MockResponsePlugin: DevProxy.Plugins/Mocking/MockResponsePlugin.cs:322 (Regex.IsMatch(request.Url, ProxyUtils.PatternToRegex(...)))
• GraphMockResponsePlugin: DevProxy.Plugins/Mocking/GraphMockResponsePlugin.cs:206
• GenericRandomErrorPlugin errors file: DevProxy.Plugins/Behavior/GenericRandomErrorPlugin.cs:206

Steps to reproduce

1. Set urlsToWatch to https://api.contoso.com/*.
2. Add a mock whose request.url is https://api.contoso.com/Users.
3. Send a request to https://api.contoso.com/users.

Expected: the mock is returned, consistent with how urlsToWatch matches.
Actual: the request is intercepted but no mock matches, so it passes through.

Notes

#113 reported the same problem in 2023 and was closed without a code change.