Add storage migration for parachain percentage

[ParthDesai]

Description

This PR adds storage migration for addition of the field in tanssi's HostConfiguration. This was introduced in #665

[github-actions]

Coverage Report

(master)

@@                     Coverage Diff                      @@
##           master   add-migration-for-config      +/-   ##
============================================================
+ Coverage   69.86%                     70.18%   +0.32%     
+ Files         264                        265       +1     
+ Lines       48405                      48979     +574     
============================================================
+ Hits        33818                      34374     +556     
+ Misses      14587                      14605      +18     

Files Changed	Coverage
/node/src/chain_spec/dancebox.rs	94.88% (+0.04%)	🔼
/node/src/chain_spec/flashbox.rs	70.82% (-0.16%)	🔽
/pallets/collator-assignment/src/lib.rs	96.38% (+0.77%)	🔼
/pallets/configuration/src/lib.rs	84.56% (-1.44%)	🔽
/runtime/common/src/migrations.rs	89.80% (+1.15%)	🔼
/runtime/dancebox/src/tests/integration_test.rs	99.71% (+0.01%)	🔼
/solo-chains/runtime/starlight/src/genesis_config_presets.rs	53.38% (+0.06%)	🔼
/solo-chains/runtime/starlight/src/lib.rs	67.09% (+0.95%)	🔼
/solo-chains/runtime/starlight/src/tests/common/mod.rs	96.37% (+0.08%)	🔼

Coverage generated Wed Sep 18 13:20:51 UTC 2024