chore: remove reflection zero type when zero value is known (PROJQUAY-6620)

[arborite-rh]

reflection uses unsafe types and is cpu intensive. we can reduce cpu
cycles on every api call by simple comparing an empty strings equality
to the value of the AuthToken.

strings.EqualFold is a std lib solution that provides similar
functionality, but that is not necessary for comparing empty strings as
it simply uses the standard equality operator as well

Topic: rm-reflection

Relative: projquay-6620
Signed-off-by: Ross Bryan robryan@redhat.com

[arborite-rh]

Reviews in this chain:
└#112 chore: remove reflection zero type when zero value is known (PROJQUAY-6620)
　└#113 chore: upgrade go.mod to 1.20 (matches Dockerfile builder) + ioutil deprecation (PROJQUAY-6620)
　　└#115 test: unit test/mock quay client (PROJQUAY-6620)

[arborite-rh]

#	head	base	diff	date	summary
0	7fd04c75	c39e6d24	diff	Feb 27 21:18 PM	3 files changed, 240 insertions(+), 8 deletions(-)
1	4c076221	c39e6d24	diff	Feb 27 21:21 PM	2 files changed, 1 insertion(+), 240 deletions(-)
2	ecb31c30	e2effef4	rebase	Mar 6 13:19 PM	0 files changed
3	96f5a360	e2effef4	diff	Mar 6 13:23 PM	0 files changed
4	fe678d01	e2effef4	diff	Mar 6 13:24 PM	0 files changed

[dmage]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: arborite-rh, dmage

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [dmage]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment