For a long time Israel has provided air support for Syrian “rebels”
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They did until the Iranian proxy forces, and Hezbollah drove them out or killed them. The Druze were caught in the middle of that whole affair - I haven’t heard how it turned out for them.
Now Israel has Iran and Hezbollah along the Golan border (there may still be pocket or two of Syrian ‘freedom’ fighters remaining but they are not a player here. This is what the fuss is about. Mostly Israeli IAF violates Syrian airspace with stand-off munitions from Lebanon airspace. The the SA-5 has ranges into Israel so it was not necessary for their plane to be in Syrian air, just near it.
Zero evidence this has happened...lots and lots of evidence to the contrary.