ci: report "npm WARN deprecated"

Problem:
Deprecated dependencies may not be noticed for a long time.

    npm WARN deprecated querystring@0.2.0: The querystring API is considered Legacy. new code should use the URLSearchParams API instead.
    npm WARN deprecated winston@3.7.1: Please use version 3.6.0 or >3.7.1 when available due to winstonjs/winston#2103

Solution:
Collect these warnings when running CI.
TODO: fail if new warnings are found.

buildspec/linuxTests.yml

@@ -35,23 +35,32 @@ phases:
                 {
                     set -e
                     set -o pipefail
-                    _PROMISE_REJ_MSG='rejected promise not handled'
+                    # Capture messages that we may want to fail (or report) later.
+                    _ERROR_PAT1='rejected promise not handled'
+                    _ERROR_PAT2='npm WARN deprecated'
+                    _ERROR_ANY="(${_ERROR_PAT1})|(${_ERROR_PAT2})"
                     mkfifo testout
                     (cat testout &)
                     xvfb-run npm test --silent | tee testout \
-                        | grep -v 'undefined..reading..range' \
-                        | grep -v CODEWHISPERER_INLINE_UPDATE_LOCK_KEY \
-                        | { >testout-rej grep --line-buffered "$_PROMISE_REJ_MSG" || true; }
-                    if [ -s testout-rej ] ; then
-                        echo ''
-                        cat testout-rej | sort
+                        | { >testout-err grep --line-buffered -E "$_ERROR_ANY" || true; }
+                    echo ''
+                    if grep "$_ERROR_PAT1" testout-err | sort ; then
                         printf '\n\nERROR: Found %s "%s" in test output (see above).\n%s\n\n' \
-                            "$(cat testout-rej | wc -l | tr -d ' ')" \
-                            "$_PROMISE_REJ_MSG" \
+                            "$(grep "${_ERROR_PAT1}" testout-err | wc -l | tr -d ' ')" \
+                            "$_ERROR_PAT1" \
                             '       This typically indicates a bug. Read https://developer.mozilla.org/docs/Web/JavaScript/Guide/Using_promises#error_handling'
                         # TODO: fail the CI job
                         # exit 1;
                     fi
+                    echo ''
+                    if grep "$_ERROR_PAT2" testout-err | sort ; then
+                        printf '\n\nERROR: Found %s "%s" in test output (see above).\n%s\n\n' \
+                            "$(grep "${_ERROR_PAT2}" testout-err | wc -l | tr -d ' ')" \
+                            "$_ERROR_PAT2" \
+                            '       Deprecated dependencies must be updated.'
+                        # TODO: fail the CI job
+                        # exit 1;
+                    fi
                 }
             - VCS_COMMIT_ID="${CODEBUILD_RESOLVED_SOURCE_VERSION}"
             - CI_BUILD_URL=$(echo $CODEBUILD_BUILD_URL | sed 's/#/%23/g') # Encode `#` in the URL because otherwise the url is clipped in the Codecov.io site