[ZBX-9458] discovery macros are not quoted correctly in calculated item expressions - ZABBIX SUPPORT

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Suppose we have the following item prototype:

echo[{#VALUE}]

If the value of {#VALUE} macro is "quoted" (quotes are part of the value), then in the discovered item key the expanded macro is quoted correctly:

echo["\"quoted\""]

However, suppose we have a calculated item prototype with the following expression:

strlen(echo[{#VALUE}])

In this case, expression of the discovered calculated item will be the following, which is not correct:

strlen(echo["quoted"])

causes

ZBX-15788 crash in poller in substitute_lld_macros

is duplicated by

ZBX-9890 LLD is not correctly processing special characters in the formula for the calculated items.