Only instantiate SessionFlusher when the SDK is enabled under the cur… #2

Job	Run time
Ruby 2.7 & Sidekiq 5.0, options - null	1m 22s
Ruby 3.0 & Sidekiq 5.0, options - null	1m 11s
Ruby 3.1 & Sidekiq 5.0, options - null	1m 1s
Ruby 3.2 & Sidekiq 5.0, options - null	1m 10s
Ruby 3.3 & Sidekiq 5.0, options - null	58s
Ruby jruby & Sidekiq 5.0, options - null	2m 6s
Ruby 2.7 & Sidekiq 6.0, options - null	1m 0s
Ruby 3.0 & Sidekiq 6.0, options - null	1m 1s
Ruby 3.1 & Sidekiq 6.0, options - null	1m 46s
Ruby 3.2 & Sidekiq 6.0, options - null	1m 1s
Ruby 3.3 & Sidekiq 6.0, options - null	42s
Ruby jruby & Sidekiq 6.0, options - null	1m 56s
Ruby 2.7 & Sidekiq 7.0, options - null	1m 7s
Ruby 3.0 & Sidekiq 7.0, options - null	41s
Ruby 3.1 & Sidekiq 7.0, options - null	48s
Ruby 3.2 & Sidekiq 7.0, options - { "codecov": 1 }	47s
Ruby 3.3 & Sidekiq 7.0, options - null	49s
Ruby jruby & Sidekiq 7.0, options - null	1m 34s
Ruby 2.4 & Sidekiq 5, options - null	1m 14s
Ruby 2.5 & Sidekiq 5, options - null	52s
Ruby 2.5 & Sidekiq 6, options - null	51s
Ruby 2.6 & Sidekiq 5, options - null	1m 11s
Ruby 2.6 & Sidekiq 6, options - null	1m 8s
	26m 16s

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