tests/: test_2608(): (red)add expected result

9ccf1c3 ("tests/: test_2608(): expect different output with mupdf master.", 2024-09-17)
changed the result for master but meant to leave in the 1.24.x result.
Re-add the file from that commit at the newly expected location.

tests/resources/test_2608_expected-1.24.x

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+No significant gamma-ray excess above the expected background
+is detected from the direction of FRB 20171019A, with 52 gamma
+candidate events from the source region and 524 background event.
+A second analysis using an independent event calibration and reconstruction (Parsons & Hinton 2014) confirms this result. A search for
+variable emission on timescales ranging from milliseconds to several minutes with tools provided in (Brun et al. 2020) does not reveal
+any variability above 2.2 𝜎. For the total data set of 1.8 h, 95% confidence level (C. L.) upper limits on the photon flux are derived using
+the method described by Rolke et al. (2005). The energy threshold
+of the data is highly dependent on the zenith angle of the observations. For these observations, the zenith angles range from 15 to 25
+deg, which leads to an energy threshold for the stacked data set of
+𝐸th = 120 GeV. The upper limit on the Very High Energy (VHE)