TUN-9800: Migrate cloudflared-ci pipelines to Gitlab CI

## Summary

This commit migrates the cloduflared ci pipelines, that built, tested and component tested the linux binaries to gitlab ci.

The only thing that is remaining to move from teamcity to gitlab are now the release pipelines that run on master.

Relates to TUN-9800

.ci/scripts/component-tests.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+set -e -o pipefail
+
+# Fetch cloudflared from the artifacts folder
+mv ./artifacts/cloudflared ./cloudflared
+
+python3 -m venv env
+. env/bin/activate
+
+pip install --upgrade -r component-tests/requirements.txt
+
+# Creates and routes a Named Tunnel for this build. Also constructs
+# config file from env vars.
+python3 component-tests/setup.py --type create
+
+# Define the cleanup function
+cleanup() {
+    # The Named Tunnel is deleted and its route unprovisioned here.
+    python3 component-tests/setup.py --type cleanup
+}
+
+# The trap will call the cleanup function on script exit
+trap cleanup EXIT
+
+pytest component-tests -o log_cli=true --log-cli-level=INFO --junit-xml=report.xml

.ci/scripts/fmt-check.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+set -e -o pipefail
+
+OUTPUT=$(go run -mod=readonly golang.org/x/tools/cmd/goimports@v0.30.0 -l -d -local github.com/cloudflare/cloudflared $(go list -mod=vendor -f '{{.Dir}}' -a ./... | fgrep -v tunnelrpc))
+
+if [ -n "$OUTPUT" ] ; then
+  PAGER=$(which colordiff || echo cat)
+  echo
+  echo "Code formatting issues found, use 'make fmt' to correct them"
+  echo
+  echo "$OUTPUT" | $PAGER
+  exit 1
+fi

.ci/scripts/windows/component-test.ps1

@@ -31,7 +31,7 @@ Write-Host "Running component tests"
 try {
     python -m pip --disable-pip-version-check install --upgrade -r component-tests/requirements.txt --use-pep517
     python component-tests/setup.py --type create
-    python -m pytest component-tests -o log_cli=true --log-cli-level=INFO
+    python -m pytest component-tests -o log_cli=true --log-cli-level=INFO --junit-xml=report.xml
     if ($LASTEXITCODE -ne 0) {
         throw "Failed component tests"
     }

.ci/scripts/windows/go-wrapper.ps1

@@ -3,7 +3,7 @@ Param(
     [string]$ScriptToExecute
 )
 
-# This script its a wrapper that downloads a specific version
+# The script is a wrapper that downloads a specific version
 # of go, adds it to the PATH and executes a script with that go
 # version in the path.