Add some static data to the store dump test suite

[teh-cmc]

I cannot reproduce #6094, see #6094 (comment):

I actually cannot repro this. I tried:

• Saving entire timeline, 0.15.1
• Saving time selection, 0.15.1
• Saving entire timeline, main
• Saving time selection, main

For now the best I can think of is to add some static data to the test suite and call it a day...

Marking as do not merge until the situation is clarified.

• Closes static components doesn't roundtrip when saved to .rrd file #6094

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