MercuryiTC IOC: update pattern for TEMP/LEVEL/PRESSURE macros

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Where?

See \\ioc\master\MERCURY_ITC\iocBoot\iocMERCURY-IOC-01.

As of writing this issue, all MercuryiTC TEMP, LEVEL and PRESSURE macros (not ones with the old VI_... prefix) have values in the format letters.letters (I will comment a test to be able to check this is still the case). This format is also shared by Newport XPS-D controllers.

However, the regex pattern for MercuryiTC is ^.*$, which is exactly anything, whereas for Newport XPS-D it is ^.*[.].*$, which describes the pattern specified above.

Therefore, it seems sensible to update the pattern values for MercuryiTC TEMP, LEVEL and PRESSURE macros.

Acceptance criteria

• Rectify the regex patterns for TEMP, LEVEL and PRESSURE macros to ^.*[.].*$
• No TEMP, LEVEL and PRESSURE macro values mismatch this pattern after the change

How to Test

verbose instructions for reviewer to test changes
(Add before making a PR)

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ConfigChecker test for checking macro value pattern match:
(Written in config tests but just refactor where needed for component)

@parameterized.expand(
        [("MERCURY_{:02d}".format(i), "TEMPERATURE/LEVEL/PRESSURE", "^(TEMP_[1-4]|LEVEL_[1-2]|PRESSURE_[1-2])$", "^.*[.].*$") for i in range(1, 3)]
    )
    def test_WHEN_a_config_has_a_mercury_THEN_get_its_pattern(self, ioc, macro_name, macro_regex, value_regex):
        iocs_xml = self.config_utils.get_iocs_xml(self.config)
        iocs = self.config_utils.get_iocs(iocs_xml)
        
        if ioc in iocs:
            config_macros = self.config_utils.check_if_macros_match_pattern(self.config_utils.get_ioc_macros(iocs_xml, ioc), macro_regex, search_for_value=False)
            globals_macros = self.config_utils.check_if_macros_match_pattern(self.global_utils.get_macros(ioc), macro_regex, search_for_value=False)

            invalid_macros = dict([(name,value) for d in (config_macros, globals_macros) for name,value in d.items() if not re.search(value_regex, value)])
            self.assertTrue(len(invalid_macros)==0, "Macro(s) not matching ^.*[.].*$ found in {} in config {}: {}".format(ioc, self.config, str(invalid_macros)))

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Pull requests:

• Update level/pressure/temp macro patterns EPICS-ioc#728
• Ticket #7322: Release notes #7363