Add server setting for resource timeouts

[eemcmullan]

Thank you for contributing to Velero!

Please add a summary of your change

Added a server config setting to use for any default timeouts.

Does your change fix a particular issue?

Fixes #(issue)
#5604

Please indicate you've done the following:

• [ x] Accepted the DCO. Commits without the DCO will delay acceptance.
• [x ] Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• [x ] Updated the corresponding documentation in site/content/docs/main.

[blackpiglet]

Please add a changelog file too.

[codecov-commenter]

Codecov Report

Merging #5926 (b298e6c) into main (c6fba55) will increase coverage by 0.02%.
The diff coverage is 23.80%.

@@            Coverage Diff             @@
##             main    #5926      +/-   ##
==========================================
+ Coverage   39.94%   39.97%   +0.02%     
==========================================
  Files         253      254       +1     
  Lines       22259    22368     +109     
==========================================
+ Hits         8892     8941      +49     
- Misses      12716    12772      +56     
- Partials      651      655       +4     

Impacted Files	Coverage Δ
pkg/cmd/server/server.go	6.58% <0.00%> (-0.05%)	⬇️
pkg/repository/ensurer.go	0.00% <0.00%> (ø)
pkg/restore/restore.go	64.76% <25.00%> (+0.13%)	⬆️
pkg/controller/backup_controller.go	55.80% <66.66%> (-0.08%)	⬇️
pkg/controller/restore_controller.go	67.56% <0.00%> (-1.45%)	⬇️
pkg/persistence/object_store.go	53.19% <0.00%> (-0.04%)	⬇️
pkg/util/results/result.go	100.00% <0.00%> (ø)
pkg/cmd/util/output/restore_describer.go	0.00% <0.00%> (ø)
pkg/restore/request.go	100.00% <0.00%> (ø)
... and 2 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[blackpiglet]

@eemcmullan
Hi, this PR looks good, but there are some conflicts due to the recent PRs merge. Could you please resolve the conflicts?

[blackpiglet]

@eemcmullan
Some PRs have been merged recently. I tried to resolve the new conflict on the web editor, but the code's indent is messed up.
Could you take a look?