### Description

Currently, support for time zones is very limited. 
We should remove it for now and re-add it when it'll be supported more broadly, at a later time. 
x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/action/EsqlQueryRequestTests.java
boolean columnar = randomBoolean();
        ZoneId zoneId = randomZone();
        Locale locale = randomLocale(random());
        QueryBuilder filter = randomQueryBuilder();
        List<TypedParamValue> params = randomParameters();
        boolean hasParams = params.isEmpty() == false;
        StringBuilder paramsString = paramsString(params, hasParams);
        String json = String.format(Locale.ROOT, """
            {
                "query": "%s",
                "columnar": %s,
                "time_zone": "%s",
                "locale": "%s",
                "filter": %s
                %s""", query, columnar, zoneId, locale.toLanguageTag(), filter, paramsString);
        EsqlQueryRequest request = parseEsqlQueryRequest(json);
        assertEquals(query, request.query());
        assertEquals(columnar, request.columnar());
        assertEquals(zoneId, request.zoneId());
        assertEquals(locale.toLanguageTag(), request.locale().toLanguageTag());
        assertEquals(locale, request.locale());
        assertEquals(filter, request.filter());
        assertEquals(params.size(), request.params().size());
        for (int i = 0; i < params.size(); i++) {
            assertEquals(params.get(i), request.params().get(i));
        }
    }
    public void testRejectUnknownFields() {
        assertParserErrorMessage("""
            {