fix: Add missing tag in Influx datatype header

[clackary]

The datatype header should have 14 values to match the 14 column headers.

Description

When working with the .csv file produced by --format influx flag, I noticed that a few datatype headers were misaligned with their corresponding columns, and the time column was missing a datatype header entirely. The list of datatype headers seems to be missing one instance of tag.

Actual behavior

tag	tag	tag	tag	tag	tag	tag	tag	double	double	long	long	dateTime
measurement	hostName	processoryType	processors	memory	kernelVersion	metric	unit	test	value	test_average	iterations	warmup_iterations	time

Expected behavior

tag	tag	tag	tag	tag	tag	tag	tag	tag	double	double	long	long	dateTime
measurement	hostName	processoryType	processors	memory	kernelVersion	metric	unit	test	value	test_average	iterations	warmup_iterations	time

How Has This Been Tested?

Run swift package --disable-sandbox --allow-writing-to-package-directory benchmark --format influx.
Verify datatype header aligns with column headers.

Minimal checklist:

• I have performed a self-review of my own code
• I have added DocC code-level documentation for any public interfaces exported by the package
• I have added unit and/or integration tests that prove my fix is effective or that my feature works

[hassila]

@ORyanHampton ping, you didn’t run into this?

[codecov]

Codecov Report

Merging #197 (f564019) into main (070dee3) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #197   +/-   ##
=======================================
  Coverage   70.83%   70.83%           
=======================================
  Files          29       29           
  Lines        3685     3685           
=======================================
  Hits         2610     2610           
  Misses       1075     1075           

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[hassila]

LGTM, thanks!