Replaced ETL_OR_STD::size with ETL_OR_STD17::size in unit tests #488

Job	Run time
Syntax Check - Clang C++03 Linux No STL (ubuntu-22.04)	26s
Syntax Check - Clang C++03 Linux STL (ubuntu-22.04)	36s
Syntax Check - Clang C++11 Linux No STL (ubuntu-22.04)	34s
Syntax Check - Clang C++11 Linux No STL Force C++03 (ubuntu-22.04)	48s
Syntax Check - Clang C++11 Linux STL (ubuntu-22.04)	36s
Syntax Check - Clang C++11 Linux STL Force C++03 (ubuntu-22.04)	41s
Syntax Check - Clang C++14 Linux No STL (ubuntu-22.04)	42s
Syntax Check - Clang C++14 Linux No STL Force C++03 (ubuntu-22.04)	35s
Syntax Check - Clang C++14 Linux STL (ubuntu-22.04)	41s
Syntax Check - Clang C++14 Linux STL Force C++03 (ubuntu-22.04)	47s
Syntax Check - Clang C++17 Linux No STL (ubuntu-22.04)	42s
Syntax Check - Clang C++17 Linux No STL Force C++03 (ubuntu-22.04)	57s
Syntax Check - Clang C++17 Linux STL (ubuntu-22.04)	55s
Syntax Check - Clang C++17 Linux STL Force C++03 (ubuntu-22.04)	52s
Syntax Check - Clang C++20 Linux No STL (ubuntu-22.04)	1m 0s
Syntax Check - Clang C++20 Linux STL (ubuntu-22.04)	1m 25s
Syntax Check - Clang C++20 Linux No STL Force C++03 (ubuntu-22.04)	58s
Syntax Check - Clang C++20 Linux STL Force C++03 (ubuntu-22.04)	1m 17s
	14m 32s

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