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Fix memory leak with lower, upper and initcap with ICU-provided collations

The leak happens in str_tolower, str_toupper and str_initcap, which areused in several places including their equivalent SQL-level functions,and can only be triggered when using an ICU-provided collation whenconverting the input string.b615920 fixed a similar leak. Backpatch down 10 where ICU collationshave been introduced.Author: Konstantin KnizhnikDiscussion:https://postgr.es/m/94c0ad0a-cbc2-e4a3-7829-2bdeaf9146db@postgrespro.ruBackpatch-through: 10

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src/backend/utils/adt
- formatting.c

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`‎src/backend/utils/adt/formatting.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -1551,6 +1551,7 @@ str_tolower(const char *buff, size_t nbytes, Oid collid)`
`1551`	`1551`	`&buff_conv,buff_uchar,len_uchar);`
`1552`	`1552`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1553`	`1553`	`pfree(buff_uchar);`
	`1554`	`+pfree(buff_conv);`
`1554`	`1555`	`}`
`1555`	`1556`	`else`
`1556`	`1557`	`#endif`
`@@ -1673,6 +1674,7 @@ str_toupper(const char *buff, size_t nbytes, Oid collid)`
`1673`	`1674`	`&buff_conv,buff_uchar,len_uchar);`
`1674`	`1675`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1675`	`1676`	`pfree(buff_uchar);`
	`1677`	`+pfree(buff_conv);`
`1676`	`1678`	`}`
`1677`	`1679`	`else`
`1678`	`1680`	`#endif`
`@@ -1796,6 +1798,7 @@ str_initcap(const char *buff, size_t nbytes, Oid collid)`
`1796`	`1798`	`&buff_conv,buff_uchar,len_uchar);`
`1797`	`1799`	`icu_from_uchar(&result,buff_conv,len_conv);`
`1798`	`1800`	`pfree(buff_uchar);`
	`1801`	`+pfree(buff_conv);`
`1799`	`1802`	`}`
`1800`	`1803`	`else`
`1801`	`1804`	`#endif`

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Commitf967a1f

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`‎src/backend/utils/adt/formatting.c‎`

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