Fixed formatting strings for timestampsWithTZ

[dikwickley]

Fixes #2966

Technical details
In parse of DateTimeFormatter the value is calculated by providing userInputOrServerResponse and formattingOptions.
We are getting formatting options like so

const formattingOptions = [
      this.specification.getFormattingString(),
      ...this.specification.getCommonFormattingStrings(),
      ...this.specification.getCanonicalFormattingStrings(),
    ];

Now in the getCanonicalFormattingStrings() which can be found here, the formatting strings for TZ timestamps are made using this

mathesar/mathesar_ui/src/utils/date-time/DateTimeSpecification.ts

Lines 171 to 175 in 704c125

	const timestampWithTZ = combine(date, timeWithTZ, (a, b) => `${a} ${b}`);
	const timestampWithTZFull = [
	...timestampWithTZ,
	...combine(timestampWithTZ, ['[AD]', '[BC]'], (a, b) => `${a} ${b}`),
	];

This code returns these values for timestampWithTZ and timestampWithTZFull

Hence dayjs was not able to parse datetimestring containing TZ timestamp.

Adding a simple T fixes the issue.

@seancolsen can you please review this.

Screenshots

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[pavish]

@dikwickley Nice catch! Looks good to me.