ConfigHandler: make updateIdeSettings work (better)

[owtaylor]

Description

ConfigHandler.updateIdeSettings() was largely ineffective because the ideSettingsPromise was stored in the ProfileLoader object, so updating to a new ideSettingsPromise resulted in the config being reloaded with the old settings. Fix this by passing the ideSettingsPromise as a parameter to IProfileLoader.doLoadConfig().

I came up with this while working on a larger change (for automatic model selection), so I don't have a great example of when this would matter, but it does seem like this would affect the use of ideSettings.userToken in core/llm/llms/index.ts -

  if (desc.provider === "continue-proxy") {
    options.apiKey = ideSettings.userToken;
    if (ideSettings.remoteConfigServerUrl) {
      options.apiBase = new URL(
        "/proxy/v1",
        ideSettings.remoteConfigServerUrl,
      ).toString();
    }
  }

This patch does not fix the case where changing the settings affects what profiles (changes to ideSettings.remoteConfigServerUrl)

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

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