[ARMPL] Fix ARM PL installation by properly injecting the S3 URL from where gcc dependencies must be downloaded from.

[gmarciani]

DONOTMERGE: test failed

Description of changes

Fix a bug in the installation of ARM Performance Library that was causing the download of GCC dependencies from gcc website rather than the ParallelCluster public bucket.

This fix is required now because we recently upgraded to GCC 11.3.
In this version, the script download_prerequisites downloads gcc dependencies from http endpoint rather than ftp, invalidating our original replacement command.

Tests

• ONGOING AMI build succeeded (tested on AL2 arm)
• Verified that gcc dependencies are fetched from S3 bucket

2025-04-14 17:16:16.808000	Stdout:     * bash[make install] action run[2025-04-14T17:16:16+00:00] INFO: Processing bash[make install] action run (aws-parallelcluster-platform::install line 117)
2025-04-14 17:16:23.189000	Stdout:
2025-04-14 17:16:23.189000	Stdout:       [execute] 2025-04-14 17:16:23 URL:https://gcc.gnu.org/pub/gcc/infrastructure/gmp-6.1.0.tar.bz2 [2383840/2383840] -> "gmp-6.1.0.tar.bz2" [1]
2025-04-14 17:16:23.439000	Stdout:                 2025-04-14 17:16:23 URL:http://gcc.gnu.org/pub/gcc/infrastructure/mpfr-3.1.6.tar.bz2 [1287202/1287202] -> "mpfr-3.1.6.tar.bz2" [1]
2025-04-14 17:16:23.690000	Stdout:                 2025-04-14 17:16:23 URL:http://gcc.gnu.org/pub/gcc/infrastructure/mpc-1.0.3.tar.gz [669925/669925] -> "mpc-1.0.3.tar.gz" [1]
2025-04-14 17:16:23.960000	Stdout:                 2025-04-14 17:16:23 URL:http://gcc.gnu.org/pub/gcc/infrastructure/isl-0.18.tar.bz2 [1658291/1658291] -> "isl-0.18.tar.bz2" [1]

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