optionally deploy Azure Bastion Host from the base deployment

[glennmusa]

Description

This change introduces the examples/remoteAccess module into the base deployment, allowing a user to deploy Azure Bastion Host and the jumpbox(es) by specifying deployRemoteAccess=true and a value for linuxVmAdminPasswordOrKey at deployment time.

To demo this (it's easiest to use the .devcontainer to generate a password with openssl) try:

my_password=$(openssl rand -base64 14)

az deployment sub create \
  --name "myRemoteAccessDeployment" \
  --location "eastus" \
  --template-file "src/bicep/mlz.bicep" \
  --parameters deployRemoteAccess="true" \
  --parameters linuxVmAdminPasswordOrKey="$my_password"

If a user attempts to set deployRemoteAccess=true but forgets to supply a password like this:

az deployment sub create \
  --name "myInvalidRemoteAccessDeployment" \
  --location "eastus" 
  --template-file "src/bicep/mlz.bicep" \
  --parameters deployRemoteAccess="true"

template validation will helpfully fail:

{
  "error": {
    "code": "InvalidTemplate",
    "message": "Deployment template validation failed: 'The provided value for the template parameter 'linuxVmAdminPasswordOrKey' at line '311' and column '21' is not valid. Length of the value should be greater than or equal to '14'. Please see https://aka.ms/arm-template/#parameters for usage details.'."
  }
}

Issue reference

The issue this PR will close #361

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles or validates correctly
  [ ] BASH scripts have been validated using shellcheck
• All tests pass (manual and automated)
• The documentation is updated to cover any new or changed features
• Markdown files have been linted using the recommended linter. (See .vscode/extensions.json.)
• Relevant issues are linked to this PR

[glennmusa]

Moved to draft so I can move the components into the /modules dir

[glennmusa]

Moved to draft so I can move the components into the /modules dir

Ready for review, removed the draft tag.