utils: gussy up timing information summary for Windows

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Emit this in a finally block ensuring that it is printed at the end under all circumstances. Reduce the column width by making the checkout SourceCache relative.

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CC: @hyp @hjyamauchi @tristanlabelle

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@swift-ci please smoke test

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Arch  Checkout                    BuildID                 Elapsed Time    
----  --------                    -------                 ------------    
x64   \llvm-project\llvm          1                       00:38:58.1090362
x64   \llvm-project\llvm          1                       00:22:22.6429105
x64   \swift-docc                 swift-docc              00:10:02.4789346
x86   \swift                      201                     00:07:35.0827479
arm64 \swift                      301                     00:07:00.2827134
x64   \swift                      101                     00:06:55.1450476
x64   \swift-corelibs-foundation  103                     00:04:47.8467444
x64   \llvm-project\llvm          0                       00:02:28.7631930
x64   \swiftpm                    12                      00:02:10.2767328
x64   \icu\icu4c                  icu-69.1                00:01:32.8483509
x64   \swift-driver               7                       00:01:25.0095639
x64   \swift\tools\swift-inspect  swift-inspect           00:01:06.1347654
x64   \sourcekit-lsp              16                      00:01:03.0790945
x86   \swift-corelibs-foundation  203                     00:01:00.0715554
x64   \swift-corelibs-foundation  103                     00:00:57.4407082
arm64 \swift-corelibs-foundation  303                     00:00:56.3216889
x64   \swift-format               14                      00:00:51.5552848
x86   \icu\icu4c                  icu-69.1                00:00:45.9732952
x64   \swift-corelibs-libdispatch 102                     00:00:45.3903276
x86   \llvm-project\llvm          200                     00:00:41.2178850
arm64 \icu\icu4c                  icu-69.1                00:00:41.1038236
arm64 \llvm-project\llvm          300                     00:00:40.8151594
x64   \llvm-project\llvm          100                     00:00:40.0963788
arm64 \swift-corelibs-libdispatch 302                     00:00:37.7445720
x86   \swift-corelibs-libdispatch 202                     00:00:37.4857717
x64   \swift-corelibs-libdispatch 102                     00:00:37.2664549
arm64 \curl                       curl-8.4.0              00:00:36.5045160
x64   \curl                       curl-8.4.0              00:00:33.1738030
x86   \curl                       curl-8.4.0              00:00:32.7644249
x64   \swift-tools-support-core   3                       00:00:30.4016441
x64   \llbuild                    4                       00:00:29.9659182
x64   \swift-corelibs-xctest      104                     00:00:27.1213400
x64   \swift-markdown             13                      00:00:26.4469682
x64   \cmark                      cmark-gfm-0.29.0.gfm.13 00:00:24.9978607
x64   \swift-crypto               8                       00:00:23.1064236
x64   \Yams                       5                       00:00:22.0248150
x64   \swift-argument-parser      6                       00:00:19.5508845
x64   \indexstore-db              15                      00:00:18.3294431
x64   \swift-system               2                       00:00:16.7624658
x64   \swift-certificates         11                      00:00:16.6539661
arm64 \zlib                       zlib-1.3                00:00:16.0922141
x86   \zlib                       zlib-1.3                00:00:15.1974372
x64   \sqlite-3.43.2              sqlite-3.43.2           00:00:12.4876425
x64   \swift-collections          9                       00:00:10.2061085
x64   \swift-asn1                 10                      00:00:09.2641157
x86   \swift-corelibs-xctest      204                     00:00:06.8269036
x64   \swift-corelibs-xctest      104                     00:00:06.5529153
x64   \libxml2                    libxml2-2.11.5          00:00:06.4315495
arm64 \swift-corelibs-xctest      304                     00:00:06.3665493
x86   \libxml2                    libxml2-2.11.5          00:00:06.0728346
arm64 \libxml2                    libxml2-2.11.5          00:00:05.9282770
x64   \zlib                       zlib-1.3                00:00:05.4845192