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/upload-lib.js

@@ -82,7 +82,7 @@ async function uploadPayload(payload, repositoryNwo, apiDetails, logger) {
         return;
     }
     const client = api.getApiClient(apiDetails);
-    const reqURL = actionsUtil.isActions()
+    const reqURL = util.isActions()
         ? "PUT /repos/:owner/:repo/code-scanning/analysis"
         : "POST /repos/:owner/:repo/code-scanning/sarifs";
     const response = await client.request(reqURL, {
@@ -116,7 +116,7 @@ exports.findSarifFilesInDir = findSarifFilesInDir;
 // depending on what the path happens to refer to.
 // Returns true iff the upload occurred and succeeded
 async function uploadFromActions(sarifPath, gitHubVersion, apiDetails, logger) {
-    return await uploadFiles(getSarifFilePaths(sarifPath), repository_1.parseRepositoryNwo(actionsUtil.getRequiredEnvParam("GITHUB_REPOSITORY")), await actionsUtil.getCommitOid(), await actionsUtil.getRef(), await actionsUtil.getAnalysisKey(), actionsUtil.getOptionalInput("category"), actionsUtil.getRequiredEnvParam("GITHUB_WORKFLOW"), actionsUtil.getWorkflowRunID(), actionsUtil.getRequiredInput("checkout_path"), actionsUtil.getRequiredInput("matrix"), gitHubVersion, apiDetails, logger);
+    return await uploadFiles(getSarifFilePaths(sarifPath), repository_1.parseRepositoryNwo(util.getRequiredEnvParam("GITHUB_REPOSITORY")), await actionsUtil.getCommitOid(), await actionsUtil.getRef(), await actionsUtil.getAnalysisKey(), actionsUtil.getOptionalInput("category"), util.getRequiredEnvParam("GITHUB_WORKFLOW"), actionsUtil.getWorkflowRunID(), actionsUtil.getRequiredInput("checkout_path"), actionsUtil.getRequiredInput("matrix"), gitHubVersion, apiDetails, logger);
 }
 exports.uploadFromActions = uploadFromActions;
 // Uploads a single sarif file or a directory of sarif files
@@ -187,7 +187,7 @@ exports.validateSarifFileSchema = validateSarifFileSchema;
 // buildPayload constructs a map ready to be uploaded to the API from the given
 // parameters, respecting the current mode and target GitHub instance version.
 function buildPayload(commitOid, ref, analysisKey, analysisName, zippedSarif, workflowRunID, checkoutURI, environment, toolNames, gitHubVersion) {
-    if (actionsUtil.isActions()) {
+    if (util.isActions()) {
         const payloadObj = {
             commit_oid: commitOid,
             ref,
@@ -230,7 +230,7 @@ exports.buildPayload = buildPayload;
 async function uploadFiles(sarifFiles, repositoryNwo, commitOid, ref, analysisKey, category, analysisName, workflowRunID, checkoutPath, environment, gitHubVersion, apiDetails, logger) {
     logger.startGroup("Uploading results");
     logger.info(`Processing sarif files: ${JSON.stringify(sarifFiles)}`);
-    if (actionsUtil.isActions()) {
+    if (util.isActions()) {
         // This check only works on actions as env vars don't persist between calls to the runner
         const sentinelEnvVar = "CODEQL_UPLOAD_SARIF";
         if (process.env[sentinelEnvVar]) {