Cherry-pick #17140 to 7.x: Add entry about TEST_TAGS in the developer changelog#17151

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jsoriano merged 1 commit intoelastic:7.xfrom jsoriano:backport_17140_7.x

Mar 20, 2020

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Commits on Mar 20, 2020

Add entry about TEST_TAGS in the developer changelog (elastic#17140 )
jsoriano
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