Add note about setting fractional gates flag

[kaelynj]

Closes #1527

Currently blocked by #1734 which will need to be merged before CI passes.

Utilizing fractional gates is a flag that is set when requesting a backend from a QiskitRuntimeService() instance and there didn't appear to be a clear page for a flag to be explained. I ended up adding it as an admonition to the "get started with primitives" page.

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One or more of the following people are relevant to this code:

• @ElePT
• @jyu00

[jyu00]

Note that the rollout of fractional gate has been delayed to August. So perhaps we want to hold on to this update until a later time.

[kaelynj]

Note that the rollout of fractional gate has been delayed to August. So perhaps we want to hold on to this update until a later time.

Yeah we'll put this on hold until the fractional gates are released.

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