Updated the `CHANGELOG` file to show changes made in milestone `3.14.0`. #2865

Job	Run time
Automated tests (25)	25m 50s
Automated tests for Custom app (25)	8m 59s
Automated tests on Tablet (25)	7m 50s
Automated tests (30)	34m 48s
Automated tests for Custom app (30)	9m 41s
Automated tests on Tablet (30)	8m 20s
Automated tests (33)	29m 49s
Automated tests for Custom app (33)	9m 13s
Automated tests on Tablet (33)	7m 42s
Automated tests (34)	1h 5m 43s
Automated tests for Custom app (34)	10m 17s
Automated tests on Tablet (34)	10m 31s
Automated tests (35)	34m 33s
Automated tests for Custom app (35)	17m 0s
Automated tests on Tablet (35)	12m 16s
Automated tests for PlayStore variant (25)	10m 11s
Automated tests for PlayStore variant (30)	10m 56s
Automated tests for PlayStore variant (33)	10m 33s
Automated tests for PlayStore variant (34)	10m 43s
Automated tests for PlayStore variant (35)	11m 54s
	5h 46m 49s

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