Enable LTO in performance test CI configurations

[msimberg]

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.01% (target: -1.00%)	:white_check_mark: ∅ (target: 90.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (42b27fa3d827b622bf8a0b990859ba29b5a125fa)	18358	13714	74.70%
Head commit (790cb3ea751380e07f315430e5cfd5c81598396e)	18358 (+0)	13715 (+1)	74.71% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1169)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

[msimberg]

Since performance tests are now run on all CI configurations, I updated this to simply use IPO on one of the configurations. I've not changed the jenkins performance tests configuration.