MockFS: Move all absolute-path-aware functions from FSEntry to MockFS

[Geod24]

This is a pre-requisite to be able to handle Windows ~sanely~ correctly.

[github-actions[bot]]

✅ PR OK, no changes in deprecations or warnings

Total deprecations: 8

Total warnings: 0

Build statistics:

 statistics (-before, +after)
 executable size=5297464 bin/dub
-rough build time=63s
+rough build time=62s

Full build output

``` DUB version 1.38.0, built on Jul 4 2024 LDC - the LLVM D compiler (1.39.0): based on DMD v2.109.1 and LLVM 18.1.6 built with LDC - the LLVM D compiler (1.39.0) Default target: x86_64-unknown-linux-gnu Host CPU: znver3 http://dlang.org - http://wiki.dlang.org/LDC Registered Targets: aarch64 - AArch64 (little endian) aarch64_32 - AArch64 (little endian ILP32) aarch64_be - AArch64 (big endian) amdgcn - AMD GCN GPUs arm - ARM arm64 - ARM64 (little endian) arm64_32 - ARM64 (little endian ILP32) armeb - ARM (big endian) avr - Atmel AVR Microcontroller bpf - BPF (host endian) bpfeb - BPF (big endian) bpfel - BPF (little endian) hexagon - Hexagon lanai - Lanai loongarch32 - 32-bit LoongArch loongarch64 - 64-bit LoongArch mips - MIPS (32-bit big endian) mips64 - MIPS (64-bit big endian) mips64el - MIPS (64-bit little endian) mipsel - MIPS (32-bit little endian) msp430 - MSP430 [experimental] nvptx - NVIDIA PTX 32-bit nvptx64 - NVIDIA PTX 64-bit ppc32 - PowerPC 32 ppc32le - PowerPC 32 LE ppc64 - PowerPC 64 ppc64le - PowerPC 64 LE r600 - AMD GPUs HD2XXX-HD6XXX riscv32 - 32-bit RISC-V riscv64 - 64-bit RISC-V sparc - Sparc sparcel - Sparc LE sparcv9 - Sparc V9 spirv - SPIR-V Logical spirv32 - SPIR-V 32-bit spirv64 - SPIR-V 64-bit systemz - SystemZ thumb - Thumb thumbeb - Thumb (big endian) ve - VE wasm32 - WebAssembly 32-bit wasm64 - WebAssembly 64-bit x86 - 32-bit X86: Pentium-Pro and above x86-64 - 64-bit X86: EM64T and AMD64 xcore - XCore Upgrading project in /home/runner/work/dub/dub/ Starting Performing "release" build using /opt/hostedtoolcache/dc/ldc2-1.39.0/x64/ldc2-1.39.0-linux-x86_64/bin/ldc2 for x86_64. Building dub 1.39.0-beta.1+commit.19.g23a47a47: building configuration [application] source/dub/internal/dyaml/composer.d(210,43): Deprecation: cannot access overlapped field `Event.implicit` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/composer.d(232,43): Deprecation: cannot access overlapped field `Event.implicit` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/composer.d(336,43): Deprecation: cannot access overlapped field `Event.implicit` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/event.d(196,5): Deprecation: cannot access overlapped field `Event.explicitDocument` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/event.d(214,5): Deprecation: cannot access overlapped field `Event.explicitDocument` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/event.d(241,5): Deprecation: cannot access overlapped field `Event.implicit` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/event.d(148,5): Deprecation: cannot access overlapped field `Event.implicit` with unsafe bit patterns in `@safe` code source/dub/internal/dyaml/event.d(148,5): Deprecation: cannot access overlapped field `Event.implicit` with unsafe bit patterns in `@safe` code Linking dub STAT:statistics (-before, +after) STAT:executable size=5297464 bin/dub STAT:rough build time=62s ```