Add environment variables to signal feature and version to the CLI

This PR ensures environment variables are set before any invocation of
the CLI.  Here is a list of vars that are set:

https://github.com/github/codeql-coreql-team/issues/1124#issuecomment-852463521

This ensures the CLI knows the features and versions of the containing
actions/runner.

Additionally:

- Fix the user agent so that it more closely aligns with user agent
  spec
- Refactor environment variable initialization so that it all happens in
  one place and call.
- Move Mode, getRequiredEnvParam, setMode, getMode out of actions-util
  and into util. actions-util is meant for utils only called by the
  action, not the runner.

The `prepareLocalRunEnvironment()` method is most likely deprecated and
should be removed. I originally added it because I had a way of working
where I would run the action from my local machine to test out changes,
but this was always a little flaky. So, I no longer use this way of
working. I will probably remove it soon.

lib/runner.js

@@ -11,7 +11,6 @@ const fs = __importStar(require("fs"));
 const os = __importStar(require("os"));
 const path = __importStar(require("path"));
 const commander_1 = require("commander");
-const actions_util_1 = require("./actions-util");
 const analyze_1 = require("./analyze");
 const autobuild_1 = require("./autobuild");
 const codeql_1 = require("./codeql");
@@ -26,7 +25,7 @@ const util_1 = require("./util");
 const pkg = require("../package.json");
 const program = new commander_1.Command();
 program.version(pkg.version).hook("preAction", () => {
-    actions_util_1.setMode(actions_util_1.Mode.runner);
+    util_1.initializeEnvironment(util_1.Mode.runner, pkg.version);
 });
 function getTempDir(userInput) {
     const tempDir = path.join(userInput || process.cwd(), "codeql-runner");
@@ -115,7 +114,7 @@ program
             url: util_1.parseGitHubUrl(cmd.githubUrl),
         };
         const gitHubVersion = await util_1.getGitHubVersion(apiDetails);
-        util_1.checkGitHubVersionInRange(gitHubVersion, logger, actions_util_1.Mode.runner);
+        util_1.checkGitHubVersionInRange(gitHubVersion, logger, util_1.Mode.runner);
         let codeql;
         if (cmd.codeqlPath !== undefined) {
             codeql = codeql_1.getCodeQL(cmd.codeqlPath);