fix(web): Support multiple IDPs of the same type

[brendan-kellam]

This PR adds support for multiple IDP providers of the same type. This is mostly useful in the scenario where you have code hosted in e.g., gitlab.com and a self-hosted gitlab instance and you want to use permission syncing. In this scenario, users need a mechanism of linking their account from gitlab.com and the self-hosted gitlab deployment.

Here's a example config:

"identityProviders": {
    "gitlab-self-hosted": {
        "provider": "gitlab",
        "purpose": "account_linking",
        "baseUrl": "https://gitlab.sourcebot.dev",
        "clientId": {
            "env": "GITLAB_SH_CLIENT_ID"
        },
        "clientSecret": {
            "env": "GITLAB_SH_CLIENT_SECRET"
        },
        "displayName": "GitLab Self Hosted"
    },
    "gitlab-dot-com": {
        "provider": "gitlab",
        "purpose": "account_linking",
        "clientId": {
            "env": "GITLAB_DOT_COM_CLIENT_ID"
        },
        "clientSecret": {
            "env": "GITLAB_DOT_COM_CLIENT_SECRET"
        },
        "displayName": "GitLab.com"
    }
}

TODOs:

• Document the object form of identityProviders
• Add additional UTs
• Test back-compat scenario

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