fix: account id endpoint metric

[yenfryherrerafeliz]

Description of changes:

• Captures the AccountIdEndpointMode metric just if the parameter is defined in the ruleset.
• Captures the account id endpoint metric whenever an account id endpoint was resolved by the endpoint middleware.

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[yenfryherrerafeliz]

Integ tests:

vendor/bin/behat --format=progress --tags=integ
...................................................................... 70
...................................................................... 140
...................................................................... 210
....................

60 scenarios (60 passed)
230 steps (230 passed)
8m43.19s (45.10Mb)

Smoke tests:

vendor/bin/behat --format=progress --suite=smoke --tags='~@noassumerole'
...................................................................... 70
...................................................................... 140
...................................................................... 210
..............

112 scenarios (112 passed)
224 steps (224 passed)
0m43.69s (94.04Mb)