Fix beacons not sent when beacon_refresh called

[Ch3LL]

What issues does this PR fix or reference?

Fixes: #68548

Previous Behavior

The interval_map would get re-set to 0 whenever we called beacons_refresh. If beacons_refresh is continually getting called for example when running a state run then the beacons would never get sent.

New Behavior

interval_map is preserved if set and the beacon still gets sent when running a state run (or any other situation that refreshes beacon)

[bdrx312]

I recommend updating the Beacon init to accept an interval map and pass it in instead of setting the variable afterwards. i.e. something like

    def __init__(self, opts, functions, interval_map=None):
        import salt.loader

        self.opts = opts
        self.functions = functions
        self.beacons = salt.loader.beacons(opts, functions)
        self.interval_map = interval_map or {}

[Ch3LL]

I think i just need to re-run the tests here, not sure how to do that @twangboy ?