api: remove redundant ImageSpec from ImageCache (issue #4436) #6379

Job	Run time
macos-12 appleclang13/C++17 py3.10 MacOS-12	1h 15m 13s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	7m 17s
macos-13 appleclang14/C++17 py3.11 MacOS-13	27m 25s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	6m 54s
macos-14 appleclang15/C++20 py3.11 MacOS-14-ARM	8m 21s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	7m 1s
Ubuntu latest releases gcc13 C++20 py3.12 avx2 exr3.2 ocio2.3	8m 19s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	7m 2s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-main avx2	10m 40s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	12m 23s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	7m 24s
windows-2019 VS2019	53m 25s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	8m 35s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.2 qt5.15	10m 42s
windows-2022 VS2022	46m 35s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	11m 53s
VFX2024 sanitizers	34m 12s
Ubuntu static libs gcc9 C++17 exr2.4	6m 43s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	11m 22s
Ubuntu clang-format	5m 36s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	12m 33s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1	7m 58s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse	7m 52s
VFX2023 abi check	7m 12s
	6h 42m 37s

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