Do not REQUEST_DATA_STREAMs by default, since it's deprecated

[TishSerg]

Proof: https://mavlink.io/en/messages/common.html#REQUEST_DATA_STREAM

Description

MavLink command REQUEST_DATA_STREAM is DEPRECATED: Replaced by MAV_CMD_SET_MESSAGE_INTERVAL.
So, QGroundControl shouldn't use it by default.

Test Steps

1. Install QGroundControl on clean machine where it wasn't installed before or wipe QGroundControl saved settings.
2. Go to Application Settings, Telemetry, Stream Rates.
3. See default setting of "Controlled By vehicle" checkbox slider (when it's ON it means REQUEST_DATA_STREAM is disabled).

Checklist:

• Review Contribution Guidelines.
• Review Code of Conduct.
• I have tested my changes.

Related Issue

#8304

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[HTRamsey]

Related to #11263

[TishSerg]

On the other hand, if those streams aren't requested, QGC doesn't get necessary telemetry, like GPS position, battery, etc...

[HTRamsey]

I'd have to double check because I always use a message-intervals-chan1.txt file, but I thought they were generally sent by default.

[TishSerg]

Sorry, I don't understand what you're talking about.

message-intervals-chan1.txt

Also, I can't find that file among QGC sources.

[HTRamsey]

It's somewhere in the ardupilot documentation, it's the way to set message rates on bootup